Should you be part of the audiophile world and need a second system, or if you are a current Naim owner wondering if the Qb passes muster, the answer is “without. Aa04-p-sb315346-34 For - $288. Any suggestions for correct settings will be much appreciated. Compare Now site51500000000128400 1500000138194. They are scanned into my computer, all of the stray lines, dots, etc. Rectifier Tube - 5AR4/GZ34ACF. KT66 EQUIVALENT = KT8C GEC (England) It is a beam power tube almost identical to the KT66 (made by the same company) EXCEPT that is has a 5 pin british type ceramic base and a top cap anode connection. 50 volts over a 10 ohm resistor on each tube. The output tubes are a pair of KT88's per channel. The new Taylor Tubes 572B is virtually an exact copy (both mechanical & electrical) of the original Cetron 572B/T160L tube. OPEN FOR BUSINESS - Music is a vital source of comfort, and it can help us get through these difficult and frustrating times. Since even tubes of the same make and model can sound different, I find that is the best way to go to get the tone I am after. EL34 handled lots of power in a small envelope. The McIntosh MC2301 300 Watt vacuum tube amplifier delivers the most extraordinarily lifelike and dynamic performance ever heard from a McIntosh tube amplifier. balance potentiometers between KT88/6550’s should be set in the mid-position. Tubes supplied by www. ***** Also note that if you use 6550's or Kt88's pin 1 on these tubes is connected to the metal collar so if you put these tubes in this amp you will read bias voltage on the metal base of the tube. Design your own custom Turret Board or Eyelet board. I am looking for the correct voltage to bias the new EL34 to in a Jadis Orchestra Reference. The 50Hz measurement was used for Lows, 700Hz for mids and 6kHz for highs. Repeat the above procedure for the other bank. Audio Transformers. There is a 22V zener diode that regulates the voltage that powers the reverb and biases the preamp that needs to be taken into account. DIY KT88 Push-Pull Monoblock Tube Amp Kit - 30 November 2009 KIT A build and review of the Odd Block KT88 Series 1 Tube Amp Kits. This gives a very clean and tight sound. DIY KT88 Push-Pull Monoblock Tube Amp Kit - 30 November 2009 KIT A build and review of the Odd Block KT88 Series 1 Tube Amp Kits. 6CA7 was not a copy of EL34, it was a design of its own. When trying to bias them in an actual amp they differed as much as 8 mA in current draw. A KT88 could have a power rating of 35 - 45 watts, which would make the calculation for 70% dissipation: So, 70% of 35 watts is 24. This gives a very clean and tight sound. Circuito VBS, bias autoregolante per la massima linearità. Congratulations on your purchase of the Ampeg V-4B 100W all-tube bass head. The only KT88 settings that I've been able find is on the 666-05 chart, but the pin settings are incorrect and the grid & plate settings appear way off. AmpliTube 4 is a guitar and bass tone studio for Mac/PC that works as a standalone application and as a plug-in for your favorite DAW. 0520 or 52 milliamps X. I use heavy card stock for covers and bind the manual with a plastic comb which gives the manual a professional, finished look. The 6L6GC tube is a 30W valve. Due to many requests by fans of our Tung-Sol line of tubes, the Tung-Sol EL84/6BQ5 has been reissued. These are not simple photocopies. 5mA 80mA 3A3 30KV 1. Tube Charts $ 29. AmpliTube recreates the entire guitar/bass signal chain from instrument to recording device, and does so in a very realistic and intuitive way. About 50 ma is right when in an ST-70 which is. Full text of "BK: B&K 700 707 1975 tube chart" See other formats. no bias adapter required. V1: JJ ECC83, V2: Tung Sol 12AX7, V3/4 JJ EL84 (matched pair), V5: 5Y3. Matching also provides an additional quality check to help reduce the possibility of receiving a faulty power tube that may have slipped by the manufacturer. Right bias adjustment: Controls the bias of the right output tube, V4 (See tube chart on pg. The price is right, the performance is off-the-chart good and you can connect it to just about anything. Update December 3rd 2019: Added example valves Type 80, ATP4, 6V6G and 6SQ7. KT88 are not same sound getting if Maker is different. Please make a Donation if you have them. Tube Care. Check the screen grid resistors. How you operate the tubes (ultra-linear, bias, plate voltage, operating points, etc. Their sales pitch is that they spec them tightly from their suppliers, and match/code power tubes to that if you replace like with like you can in theory get away without re-biasing the amp. Gear Talk - Power Tube Comparison El34 vs El84 vs 6V6 vs 6L6 vs 6550 vs KT88 (Reussenzehn) Lothar's Guitar School - Gear Talk - Reussenzehn El34 In this episode I show you my Reussenzehn El34. Bias current is the amount of electrons flowing from the cathode to the plate with no audio signal on the control grid (idle current). Groove Tubes …. DIY KT88 Push-Pull Monoblock Tube Amp Kit - 30 November 2009 KIT A build and review of the Odd Block KT88 Series 1 Tube Amp Kits. So the 6L6GC will give you more power and more clean headroom. Sound I am emphasizing again that my impression is based on SR1a which Aegir isn’t recommended to drive (even Jason mentioned so!). Posted on May 5, 2015 May 8, 2015. Environmental Protection Agency 401 M Street, S. Life Test button; Terminals for attaching external self-bias resistor. Click here to buy complete sets of tubes for your Z amps from The Tube Store. 5 watts divided by a plate voltage of 450v would = 0. later i might try a 6sl7 im not very familiar with those. V6-V9- 6L6GC (50/100 Watt) and KT88 (150 Watt) Output Each fine production tube is tested and matched to our exacting specifications. This is one of the most affordable tools to measure an amp's bias, and see how two tubes perform at the same time. With circuitry borrowed from our most advanced. For a single channel, I need 2 tubes, 1 bias power-supply, a highly regulated power supply and a phase shifter. (5) Why not - Jim Smith 11:28:53 02/13/10 (0) ; RE: Quicksilver KT88 blowing fuses/possibly power tubes-could a bad 5AR4 rectifier cause this? - Astroimage 10:08:48 02/13/10 (3) RE: Quicksilver KT88 blowing fuses/possibly power tubes-could a bad 5AR4 rectifier cause. METHODOLOGY FOR XRF PERFORMANCE CHARACTERISTIC SHEETS Technical Branch National Program Chemicals Division Office of Pollution Prevention and Toxics Office of Prevention, Pesticides, and Toxic Substances U. Given below is the tube amp bias calculator to find the bias in ampere or milliampere (mA or A). Abbreviations. Also thought about the Audioromy FU29 tubed amp. KT88's or 6550 tubes will last longer in an ST-70 than EL34 tubes. The amps can run EL34, 6L6GC, 5881, 350B, KT66, KT88, 6550, KT90 and more (some tube choices require a 5U4GB rectifier tube)" FWIW, the KT88 is not my favorite output tube. I also did some swapping of preamp tubes and this also made a great improvement. 00 * Tweed One-6 GS, 5F2 Style Amp-Kit Tweed One-6 From €375. AC-15; a lot more Vox schematics are on the Vox Heaven Page; Western Electric. McIntosh Amplifiers Part 2 2-KT88/6550 output, 12AX7, 12AU7, 12BH7, 12AT7/12AZ7. I hope your tech had a schematic and didn't just install a bias pot willy-nilly. High-gain guitar amplifiers , are an increasingly popular type of amplifier, built for high amounts of preamp gain, to give a very overdriven sound. 40 watts in cathode bias using a pair of 40 Watt line trannies looks attainable, but 55-60 watts needs a bias supply and our centre-driven multiplier presents problems. External bias adjustment and test points are located on the chassis near the output tube sockets. I have an older SVT (mid 70's) that is running off of six 6550's. no bias adapter required. Also, the KT150s tend to bias hotter (a higher bias current for any given set of operating conditions) than KT-88s so you need to be sure you can adjust the bias properly - bias that can't be adjusted properly is not a defect in the tube. a push-pull amp. The only KT88 settings that I've been able find is on the 666-05 chart, but the pin settings are incorrect and the grid & plate settings appear way off. Only a few of the most popular tubes are shown. The output tubes are a pair of KT88's per channel. 06% and 20 HZ being. 5 watts divided by a plate voltage of 450v would = 0. Increasing the cathode bias resistor is often necessary. Based on the original from 1971, the Ampeg V-4B 100W all-tube head embodies the legendary tone of the classic V-4B in a tough-as-nails package, ready to take the stage with the flexible output control and pure vintage Ampeg grind you crave at volume levels. Substitutes: 6550, 6550A, KT90 Type 2 or 3, KT99, KT100, KT12O/KT150 (only if sufficient bias is present) Though your manufacturer may have settled on a certain brand of these, the hunt for cool NOS types may be sonically worthwhile, or try switching to EH KT90s or bigger for more impact. Some of the new prod kt88's pull a boatload of current to power the heaters. Hello, I just wanted to check on something. 19 2 bias supply caps 100uF, 100V 647-TVX2A101MCA 1. Most of them show these audio beauties used in the push-pull configuration in order to obtain the greatest efficiency and the most power output. In September of 1950 Tung-Sol introduced the 5881, an uprated and industrial version of the 6L6GA with a 23. Unfortunately David's son Michael seems to have gone out of business supplying spares and manuals for his father's turntable range. Power Tubes - 6L6 STR 445 - Matched Pair. Due to the high current and power capability of these tubes, it is very important that the KT88 tubes are well matched. Many articles have appeared regarding projects using one of the most sturdy, versatile, and trustworthy audio tubes ever made — the 6550. With an output of 300 Watts, it provides enough high power to drive even the most demanding loudspeaker. 6CA7 - America's Answer. Whichever way you choose to set the impedance for these tubes, use the same bias range in the chart for these 3 tube types (treat them all as 6L6GC). An American tube that has the same octal base as a 6V6 - and is a REAL PENTODE is the 6K6, and it requires about the same signal/drive/grid voltage to be driven to full power as a 6V6 - they can be used in lower voltage cathode biased (<300) amps with out any change of bias, etc. Tube bias of an amp is used to find the optimum setting for the flow of current in the tube when the amp is idling. Please make a Donation if you have them. Musical details are very accurate with strong headroom dynamics. 91 23Nov15 Corrected connection to Bias supply from Rectifier from pin 8 to pin 6. They are capable of delivering 100 watts per pair and this is the typical application in which they are applied in the TWO/NINETY/TWO and TWENTY ONE FIFTY power amps and SIG:X head. 3 NEGATIVE FEEDBACK. Set your multimeter to DCV > 200m. The 811A is a zero grid bias transmitting triode. An audio frequency generator was used to sweep from 10Hz to 20kHz with the input voltage measured at the 6L6GC control grid ( ) and the output voltage measured at the output transformer secondary winding while connected to an 8 ohm load. In fact I think of that stuff since a really long time now (since the first amp, I 've built ten years ago). net Or call us at 253-756-6489. De-bias button is pretty cool idea (well, in both means lol). Bias tools etc. Right bias adjustment: Controls the bias of the right output tube, V4 (See tube chart on pg. Trasformatori di output su specifica Esoteric. The 10K (R1) biases the tubes to cut off in standby receive mode. I've been using the EH KT-88s and the older EI KT-90 Type IIs in my Mac MC-75 monoblocks. Helpful information links. It has test points on the front of the amp to bias it with. (throught the tube bias) but It need to be really stable to avoid distortion. The Official Blackstar Amplification site, featuring Guitar Amplifiers, Guitar Amps, Effects Pedals, Merchandise, Dealers, Videos, Artist News. 5mA 80mA 3A3 30KV 1. Hoffman Amplifiers stuff. Increasing the cathode bias resistor is often necessary. 's Genalex production line. Many articles have appeared regarding projects using one of the most sturdy, versatile, and trustworthy audio tubes ever made — the 6550. AmpliTube recreates the entire guitar/bass signal chain from instrument to recording device, and does so in a very realistic and intuitive way. 6l6gc, 5881, el34, 6550b, kt88 Notes: The above examples of possible combinations are to help you narrow down the choices of transformers for your favorite tube types. Measuring Device For Bias Four octal socket adapters, For the control of the retirement, At 6L6GC, 6550, EL34, 6V6 GT, 5881, KT88, KT66, KT90, KT100, 7027A, With illuminated display, Made in Germany. You check the bias on the EL34s, swap in the KT77s and adjust to match, or a little hotter if you want. Power Tubes - EL34 STR 450 Siemens NOS. Musical details are very accurate with strong headroom dynamics. The tube can stop the flow completely (called cutoff) or let it flow at maximum (called saturation). METHODOLOGY FOR XRF PERFORMANCE CHARACTERISTIC SHEETS Technical Branch National Program Chemicals Division Office of Pollution Prevention and Toxics Office of Prevention, Pesticides, and Toxic Substances U. The numbers here are WATTS at various frequencies. is the power rating of the power tube, is the bias current, and. EL34 handled lots of power in a small envelope. This tester differs substantially from the 539B & C and unfortunately the settings from the B&C don't work for the 539A. My recommended bias measurement method is the "Output Transformer Resistance Method. later i might try a 6sl7 im not very familiar with those. EVERY bias calculator/table I found on the net says almost perfect 2 times higher (~40mA). Remember VAC's Phi 200 amplifier, the one whose KT88 tubes range in price from $40 to $400 each? The EAT tube is the one at the high end of that spectrum. Close manufacturing specification tolerances and improved processing provide improved reliability and superior sonic performance. Most of the datasheets are in PDF format and some are links to other HTML pages. Covering a wide range of tubes including 12AX7, 12AT7, 12AU7, EL84, 6L6, EL34, 6V6, KT88, KT77, 300B, 2A3, 6CA7 and the list goes on. Full text of "BK: B&K 700 707 1975 tube chart" See other formats. The EH 12AT7 is a good choice for reverb driver, line stage, and phase inverter positions. Available immediately. By Rob Robinette. High reliability and exceptional music - listening experience. Ditto for Mesa. External bias adjustment and test points are located on the chassis near the output tube sockets. Using four KT88 power tubes, these amps were very powerfull, very loud and very expensive. They cost $17,000. Stemming from over 6 decades of innovation, the latest Dynaco amplifiers and preamps deliver music with the dynamics and excitement that is only possible when mixing chemicals inside a glass tube. 40 watts in cathode bias using a pair of 40 Watt line trannies looks attainable, but 55-60 watts needs a bias supply and our centre-driven multiplier presents problems. (throught the tube bias) but It need to be really stable to avoid distortion. 60% gives you enough wiggle room for power fluctuations. The output of this small amplifier in which a 6V6GT output pentode is connected as triode is about 4. 6l6gc, 5881, el34, 6550b, kt88 Notes: The above examples of possible combinations are to help you narrow down the choices of transformers for your favorite tube types. A dual potmeter allows you to connect both left and right channel on one potentiometer. Page 14 Power On The BIAS ADJustments were made during the final Input Switch testing of the MC2000 at the factory. 5 watt plate dissipation, opening the doors to the hi-fi movement of the 1950s. You check the bias on the EL34s, swap in the KT77s and adjust to match, or a little hotter if you want. Re: Push-pull emitter follower amp (LTSpice) The second circuit does not work as a current amplifier, because the power supply ground connection is missing. This is the early version of the famous 539B/C Series Engineer's model one of the finest testers ever produced. The electronically controlled bias current adjustments are child’s play so I tried out the dispatched set of KT88. The amplifier has very few. Latest: Hello from S. Many articles have appeared regarding projects using one of the most sturdy, versatile, and trustworthy audio tubes ever made — the 6550. Signal Level, Speaker Level, Tube Audio. I am looking for the correct voltage to bias the new EL34 to in a Jadis Orchestra Reference. An EL34 tube has a recommended bias at around 320mv-350mv. com offered a set of five EL34-type tubes for review (JJ KT77; JJ EL34 II; Svetlana EL34; Genalex Gold Lion KT77 and Mullard EL34) I jumped at the opportunity. If you can't afford. 6L6 comparison chart. Changes/experimentation with resistor values in circuit 6. Has 120 and 240 Volt primary. We agreed that I’d throw a few of my own tubes, including the Tung-Sol EL34B and Shuguang 6CA7-Zs I purchased from thetubestore. Product Review - A Comparison of 6550 and KT-88 Power Tubes - June, 2002 Jason Serinus. Medical, Plug-In Isolation, Autotransformers. I rebiased the EL34's up to 90mv and the volume increased to what seemed to be "normal". What is Bias? Bias voltage is the voltage difference between a tube's cathode and control grid. In fact I think of that stuff since a really long time now (since the first amp, I 've built ten years ago). The price is right, the performance is off-the-chart good and you can connect it to just about anything. Power Tubes - KT-88 STR 488 - Matched Pair. I was told by Orange technician (UK) that it should be 18-22mA per tube (wherever it's 6550 or KT88). 100 watts with two KT88 is also push-pull. These power tubes also have a snarly sound but it's a little warmer-sounding than the EL84 tubes. They seem to bias very hot when you use them in place of a 6L6GC. The bias is a NEGATIVE voltage applied to the control grid of each valve. Musical details are very accurate with strong headroom dynamics. TUBES To create a push pull amplifier is possible to use triode and pentode but obviously to test many configurations like the ultra linear we need a pentode. I do know the bias current requirements for the 6550's, KT88's & KT90's when I was using Manley monoblocks, which required individual biasing. The anti-biasing constants are typically found in the appendices of textbooks. How you operate the tubes (push-pull, push-pull parallel, ultra-linear, class, B+, bias, operating points, etc. Tubes supplied by www. KT88 Author: M-O Valve Subject: JA-FP-2000-10-01 Created Date: 10/1/2000 7:35:29 PM. TUBES To create a push pull amplifier is possible to use triode and pentode but obviously to test many configurations like the ultra linear we need a pentode. I thought why not use a respectable op- amp and a pair This amp had its genesis in the Widlar (pronounced Widelar) circuit below published in the application note of 1969 An interesting analysis of the here: The op amp deliberately has a l… feedforward capacitor. The middle projection or tongue of the E is placed through the center of a coil of wire, and the I placed at the end like this" EI" so the iron forms a complete magnetic path through the center and around the outside of the coil. A better conversion would offered by a 180-ohm resistor, which would set an idle current of 100mA through the output tube and offer a conversion ratio of 55mA per input. Dynaco is the very soul of high fidelity audio. Before I get to the tubes there is something we need to consider about the Semi Auto Bias Module in the Elekit TU-8340VK. Today, there are a number of quality KT88 tubes available for audio and guitar applications. Use with EL34, large bulb 6CA7/EL34,6550, KT88. 91 23Nov15 Corrected connection to Bias supply from Rectifier from pin 8 to pin 6. This is the early version of the famous 539B/C Series Engineer's model one of the finest testers ever produced. Dave Hunter is a writer and musician who has worked in both the U. To the point where you have to modify your amp to accept them in a usable bias range. DIY KT88 Push-Pull Monoblock Tube Amp Kit - 30 November 2009 KIT A build and review of the Odd Block KT88 Series 1 Tube Amp Kits. General Tab · X, Y – position of the chart on the Runtime Window is shown here and can be modified. This is the lower portion of the chart, the "comparative study". Ground and reference are better understood as two different types from the perspective of both physiology and amplifier design. hp = Heptode Unit. { "inCheckoutPromo": [] }. the 2 tubes and set the current level to the value on the chart. In German: Single Ended: 48. 5 watts divided by a plate voltage of 450v would = 0. How to Test Vacuum Tubes. AND has several Western Electric tubes types right on the chart! 300A/B, 101L, 102L, 396A, and 417A! Will also test most common audio tubes like 6CA7, 6L6, 6SN7, KT88, 7247, 12AX, AU, AT, 7247, 7199,7355, 7591 and 7868 (with adapter). 100 Amplifiers, part 2 , 1945 – 54. This is the early version of the famous 539B/C Series Engineer's model one of the finest testers ever produced. This modification will allow use of either 8417, KT88 or 6550 valves & possibly EL34. The numbers here are WATTS at various frequencies. Total maximum power to amp from all Secondary windings of PT = 399W + 120W + 2. When you have the bias checked, find somebody uses a scope if they also use a bias probe. { "inCheckoutPromo": [] }. t = Triode Unit. the chassis is setup for 4 6l6 tubes. About 50 ma is right when in an ST-70 which is. Other tubes from the 6550/KT88 family will work, but the best overall sound can only be obtained from the KT120. Increasing or decreasing that voltage by a small amount will affect the amount of current drawn by the anode. Chart properties provide many ways to customize chart appearance. is the power rating of the power tube, is the bias current, and. I've been using the EH KT-88s and the older EI KT-90 Type IIs in my Mac MC-75 monoblocks. The monoblock tube amp kit uses an SRPP input stage with 5751 driver tubes and a push-pull output stage with KT88 power tubes. You can find kits in the online store! In case you have heard horror stories about the metal bases being connected to a pin and causing shorts, the culprits are the sovtek KT88 and KT66 tubes. It considers both reactive loads and resistive load. The new Taylor Tubes 572B is virtually an exact copy (both mechanical & electrical) of the original Cetron 572B/T160L tube. That would demand a supplied Voltage of 2V+2V+1,5V+1,5V = 7 V. thetubestore. Withous this negative bias the tube will conduct its full possible current and burn up very fast. Marshall Amp Parts for marshall amps. The pentodes Hegeman chose were 12BY7 video pentodes. They were in production up to 1974. De-biased Aegir is cooler than Vidar after hours of rest. The amp tech asked what I'd like the amp to be biased to. Manufacturer's data is available for triode operation of some popular types of tetrode, pentode and beam power tubes such as EL34/6CA7, 6V6GT, KT66, KT88, 807, 6146. Hi music men (and women), I've recently put some KT88s in my sixty five at a reputable tech in Manchester (UK). William DuVall of Alice In Chains and George Metropoulos have paired up to create the greatest Metropoulos amp yet, the DVL-1. The resistor value is determined based on design averages for plate voltage and current. The 50Hz measurement was used for Lows, 700Hz for mids and 6kHz for highs. Bias is an alternating current of high frequency which is applied to the tape recorder to reduce distortion. There is a lot of discussion on the black magic of setting the bias on the output valves in your amp. The OP's amp can accommodate either an El34 or Kt88 tubes and these aforementioned bias setting are also quoted in the OP. This is sick, beacue I don't know what's going on. 6CA7 - America's Answer. Find the right Dynaco™ parts to restore, repair or upgrade your original Dynaco™ vacuum tube amplifier. KT88 (6550 equivalent) Genalex GOLD LION reissue, new productionMATCHED PAIR: Looks and sounds like the 1960s vintage Genalex Gold Lion KT88, one of the most famous vintage power tubes in the world. Many folks use a bias probe incorrectly. The sound was reproduced through a 1971 Marshal cabinet with 4 Celestion G12M "greenback" speakers. Plate Voltage mA: Calculate Plate Dissipation Based On Plate Voltage And Cathode Current Readings. JJ Electronic KT88 Factory Data Sheet: KT88 Factory description: Has more power, a wider frequency response and dynamic range than any other KT88/6550 on the market. Today, people commonly swap these tubes around to tailor the Marshall tone to their liking — with bias correction of course!. An audio frequency generator was used to sweep from 10Hz to 20kHz with the input voltage measured at the 6L6GC control grid ( ) and the output voltage measured at the output transformer secondary winding while connected to an 8 ohm load. KT120 TUNG-SOL. Whichever way you choose to set the impedance for these tubes, use the same bias range in the chart for these 3 tube types (treat them all as 6L6GC). If you are uncertain that you are experienced enough to work on a live high voltage amp, please take your amp to a professional to get it biased. ) will change optimum plate to plate load impedance. Visit our online store for easy ordering of NOS and new production vacuum tubes. Topic - Quicksilver KT88 blowing fuses/possibly power tubes-could a bad 5AR4 rectifier cause this? - padreken 11:19:21 02/12/10. Trasformatori di output su specifica Esoteric. The bias is a NEGATIVE voltage applied to the control grid of each valve. it is funny how they blindly copy the "insomnia ideas" from Tube Journal again and again )) kodabmx, for the output stage: - each network of 2 x SR1100 + 10K + 10,000uf (paranoid!) can be replaced by a simple Zener, because it is what it does;. Designed for endurance and longevity for application in the audio industry. With circuitry borrowed from our most advanced. When using multiple speaker cabinets refer to the back panel Speaker chart for the proper Impedance Selector position. You can find kits in the online store! In case you have heard horror stories about the metal bases being connected to a pin and causing shorts, the culprits are the sovtek KT88 and KT66 tubes. They cost $17,000. 50 volts over a 10 ohm resistor on each tube. QUAD TUBE AMP Bias Meter 6L6 El34 KT88 Probe with PLATE VOLTAGE MEASUREMENT - $69. 205) I have a Jackson 648S and the scroll doesn't show an EL34 but the Jackson Special Tube Data book shows it to be a 6CA7 equivalent or similar. Has 120 and 240 Volt primary. High reliability and exceptional music - listening experience. To the point where you have to modify your amp to accept them in a usable bias range. Manufacturer's data is available for triode operation of some popular types of tetrode, pentode and beam power tubes such as EL34/6CA7, 6V6GT, KT66, KT88, 807, 6146. This tester is set up by using a tube manual for particular tube being tested. Vacuum Tube Calculators Basic Theory - using 21st-Century technology to design vacuum tube preamps, power amps, and power supplies System Design - a professional methodology for crafting a complete guitar amplifier. ) will change optimum plate to plate load impedance. is a complete driver for class B load 4. Rectifier comparison and interchangeability chart. Our Level-2 mod takes this amp to the next level allowing it to compete with the big boys that play in the $4,000 - $5,000 league. The computer interface (Top Right) is a “Brainbox” US-159 isolated USB to RS232 interface, providing a galvanic-ally isolated USB connection to my PC. In addition, we offer an array of new "select" Dynakit™ classic vacuum tube. Digital Tube Amp Bias Meter 4 6L6 KT88 EL34 6V6 6550. It included service from single ended class A to push pull class AB2, but it did not have the specs for class C RF operation. And many European tube manufacturers soon started manufacturing EL34. It has been designed around the magnificent KT120, one of the toughest tubes available. , and the voltages between the CT and screen/plate taps on the OT to see if there's much difference. "The best blues amp for me would have to be the Dumble ODS or a Two Rock John Mayer, purely for the touch response. The sound was reproduced through a 1971 Marshal cabinet with 4 Celestion G12M "greenback" speakers. Louis after he put a toggle switch on the back of the chassis to switch between EL34's and KT88's. , less than 15W, and are invariably cathode-biased. The RF in and out relay is energized first and then the bias relay is energized last. The author cames no responsibility for any information provided. Therefore the battery can last much longer, over 100 hours. (read chart). (The last two readings were for a different tube than was used to test the other six testers. The chart I provide at the beginning of this article shows a 6L6GX, which is likely unavailable as NOS these days. Fender '64 Custom Deluxe Reverb 20W 1x12 Tube Guitar Combo Amp. A perfectly balanced push-pull stage will cancel all even harmonic distortion and sum odd harmonic distortion generated within the power stage. The negative grid voltage method: This method involves measuring the DC voltage on the grid of the output tubes, and setting it to a recommended value. Due to its enlarged bias current window, the SE can run not only with EL34, 6CA7, 6L6, KT66, KT77 or 5881 but also the higher-current 6550, KT88, KT90 or KT100. Many folks use a bias probe incorrectly. but some bias adj. If you want to go 6550 or KT88, sure, you need to be more deliberate. The purpose of this comparison is simply to provide guitar players with a frame of reference to help in finding the best current production 12AX7 for their needs. With circuitry borrowed from our most advanced. In the case of this amp with EL34's I would personally bias the power tubes around 30 mA. KT88 1B3GT HW TV Pulse Rectifier F 1. Sound Clips page - Tube amp sound clips and tunes of all types. Class A operation is often found in high-end audio, but less often in guitar and bass amplification. All parameters, plate voltage, grid bias, etc, can be adjusted and monitored. EL34 Power Tube. 95; Back in the late 50s-early 60s, Harman Kardon manufactured a 60-watt push-pull tube powerhouse called the Citation II. Before I get to the tubes there is something we need to consider about the Semi Auto Bias Module in the Elekit TU-8340VK. For amps with cathode bias resistors you can simply measure their voltage drop and use the Tube Dissipation Using Cathode Resistor Voltage Drop calculator. Change resistor between bias pot and bias diode to 10K. AND has several Western Electric tubes types right on the chart! 300A/B, 101L, 102L, 396A, and 417A! Will also test most common audio tubes like 6CA7, 6L6, 6SN7, KT88, 7247, 12AX, AU, AT, 7247, 7199,7355, 7591 and 7868 (with adapter). A vacuum tube replacement device includes an indicator. Biasing an amp requires some knowledge of tube amp circuits and experience with high voltage. In addition, we offer an array of new "select" Dynakit™ classic vacuum tube. Esoteric A-100 Modello celebrativo 25 anni Finale di potenza stereo a valvole in push-pull. 6CA7 was not a copy of EL34, it was a design of its own. supplies bias and screen voltages for the tester. Chart properties provide many ways to customize chart appearance. 5 Watts max Mutual. The best thing to do is contact Lumley if not contact the people that own them as they should be able to guide you on the proper bias value. Just 1 volt difference in the bias voltage can make a difference of 10 or even more ma, of anode current. In fact I think of that stuff since a really long time now (since the first amp, I 've built ten years ago). See the Unofficial Univox page; Also see the Schematic Heaven archive; Vox. Improvements have been made since this trace was taken, I shall do some more and post them soon. Today, there are a number of quality KT88 tubes available for audio and guitar applications. Found 148 records in Search of Tubes Asylum. The monoblock tube amp kit uses an SRPP input stage with 5751 driver tubes and a push-pull output stage with KT88 power tubes. In September of 1950 Tung-Sol introduced the 5881, an uprated and industrial version of the 6L6GA with a 23. The amplifier class is selected by biasing the control grid of the output tube into the range to select the appropriate conduction cycle. The amps can run EL34, 6L6GC, 5881, 350B, KT66, KT88, 6550, KT90 and more (some tube choices require a 5U4GB rectifier tube)" FWIW, the KT88 is not my favorite output tube. Also, the KT150s tend to bias hotter (a higher bias current for any given set of operating conditions) than KT-88s so you need to be sure you can adjust the bias properly - bias that can't be adjusted properly is not a defect in the tube. MW Hi Stefano, The Transcriptor Saturn is a fine turntable, designed by David Gammon and now less well known than the Transcriptor Reference. Used to power tube pedals. Eligible for Free Shipping. This is my first successful vacuum tube project. Use this tool at your own Risk. The EL34 is found in the most well-known UK heads, such as Marshall, HiWatt, and Sound City. Datasheets for the EL34 suggest a class A push-pull operating point of 400V @ 65mA per tube into a 5k load, giving us 16. Musical details are very accurate with strong headroom dynamics. There are only two things to worry about in biasing a guitar amp. 495,-- SPIRIT III Integrated or Power amplifier; 2x55W Pentode or 2x35W. Introduction to Thermionic Valves (Vacuum Tubes). Bias current is the amount of electrons flowing from the cathode to the plate with no audio signal on the control grid (idle current). This requires opening the case which isn't as difficult as it sounds. A built in bias meter simplifies keeping biasing. Single ended can save a few dollars, though. Full text of "Practical Electronics 1966 August" See other formats. A dual potmeter allows you to connect both left and right channel on one potentiometer. They cost $17,000. The sound was reproduced through a 1971 Marshal cabinet with 4 Celestion G12M "greenback" speakers. Here at Dynakit™ you will find the right parts to restore, repair or upgrade your original Dynaco™ vacuum tube amplifier. For one thing, your bias voltage is much bigger and so you have to factor that in if your B+ is already determined and you’re using cathode bias. I have seen 150k and 220k as well. KT88 - Kinkless Tetrode Power Tube - The Tubes that made Rock 'n' Roll - Power Amplification Tags: vale, poweramplification-marshall, stack, power, amplification Available in Plus Size T-Shirt. Page 27 FINAL INSPECTION Visually inspect all connections and wiring comparing against the master charts and manual. - MCS 3865 integrated amplifier *SERVICED* 100 % working. supplies bias and screen voltages for the tester. All this is exactly as expected from KT88 Kinkless Tetrodes run in push-pull, using modern valves working with fixed bias, confusingly meaning you have to adjust it. Hickok Tube Tester. Optionally, capacitor in bias circuit may be increased (up to 220 MFD) to replace original 60 MFD 150V part. SUBSCRIPTS FOR MULTI-UNIT TUBES: b = Beam Power Unit. KT88 (6550 equivalent) Genalex GOLD LION reissue, new productionMATCHED PAIR: Looks and sounds like the 1960s vintage Genalex Gold Lion KT88, one of the most famous vintage power tubes in the world. Choosing between EL34, KT88, or KT120 tubes. Single-ended (SE) power output stages are probably the simplest form of power amplifier. Latest: Hello from S. This article has also been viewed 140,592 times. When using multiple speaker cabinets refer to the back panel Speaker chart for the proper Impedance Selector position. One thing you also need to consider is the amount of current draw that they have. Tubes supplied by www. A perfectly balanced push-pull stage will cancel all even harmonic distortion and sum odd harmonic distortion generated within the power stage. KT66 EQUIVALENT = KT8C GEC (England) It is a beam power tube almost identical to the KT66 (made by the same company) EXCEPT that is has a 5 pin british type ceramic base and a top cap anode connection. Dynaco is the very soul of high fidelity audio. 5" wide, 10" deep, and 6" tall and weights well over 20 pounds. The Tube Amp Schematics Library. Please see the substitutes at the top of the page for more details. For example, judged according to plate characteristic curves 6L6 tubes generally overdrives harsher than a EL34 tubes. The sound was reproduced through a 1971 Marshal cabinet with 4 Celestion G12M "greenback" speakers. KT88 is a low distortion, high output power tube developed specifically for audio. To create this article, 21 people, some anonymous, worked to edit and improve it over time. 40 watts in cathode bias using a pair of 40 Watt line trannies looks attainable, but 55-60 watts needs a bias supply and our centre-driven multiplier presents problems. 1nstalling dual-bias control modifcation for separate bias control Of each output tube 8. The 6L6, 7581A, 6V6, 6550, EL34, 5881, KT66, KT88, KT90, KT100, etc. Rectifier Tube - 5U4G. It uses a complement of 12AU7 and 12AX7 valves in the gain stage, and comes stock with a set of EL34 driver tubes which can be swapped out for KT88 or 6550 tubes by means of a simple bias adjustment. The amp can also handle the even more powerful KT150. Today, people commonly swap these tubes around to tailor the Marshall tone to their liking — with bias correction of course!. Potenza 2 x 50W su 8 ohm. Also the most common electrical circuits are given for KT88 and 6550. When using multiple speaker cabinets refer to the back panel Speaker chart for the proper Impedance Selector position. In fact I didn't realize the full extent of the superb bass quality of my Altec Corona 832A loudspeakers until I put the Still Audio EL84 into the system, and its bass quality and quantity are at a significantly. 7 POWER TUBE MISMATCH. An amplifier tube controls the flow of electrons running through it. Marshall DSL40CR. Pricing & History. com over the years. A vacuum tube replacement device includes an indicator. But in terms of tone, the JCM is generally better for that chunky, mids-heavy, huge bottom wall of sound, while the Rec is better for insane gain stages and squealing highs. TUBES To create a push pull amplifier is possible to use triode and pentode but obviously to test many configurations like the ultra linear we need a pentode. Measuring Device For Bias Four octal socket adapters, For the control of the retirement, At 6L6GC, 6550, EL34, 6V6 GT, 5881, KT88, KT66, KT90, KT100, 7027A, With illuminated display, Made in Germany. Enter plate voltage: Select output tube: EL84: 6v6: 6L6: 7027: KT66/EL34: 6L6GC: kt77: KT88: 6550: KT120: This information is for reference only. Found 148 records in Search of Tubes Asylum. An American tube that has the same octal base as a 6V6 - and is a REAL PENTODE is the 6K6, and it requires about the same signal/drive/grid voltage to be driven to full power as a 6V6 - they can be used in lower voltage cathode biased (<300) amps with out any change of bias, etc. I was told by Orange technician (UK) that it should be 18-22mA per tube (wherever it's 6550 or KT88). This is sick, beacue I don't know what's going on. Each amp had 15 KT88 tubes, two chassis connected by a thick umbilical, granite bases, big glass meters and immense output transformers on the back. Should you be part of the audiophile world and need a second system, or if you are a current Naim owner wondering if the Qb passes muster, the answer is “without. Environmental Protection Agency 401 M Street, S. Use this tool at your own Risk. Remember VAC’s Phi 200 amplifier, the one whose KT88 tubes range in price from $40 to $400 each? The EAT tube is the one at the high end of that spectrum. In addition, we offer an array of new "select" Dynakit™ classic vacuum tube. Then go back to 300B-chart sheet and input the tube ID there. The output tubes are a pair of KT88's per channel. (The last two readings were for a different tube than was used to test the other six testers. or does anyone know if this amp is auto bias for the tubes or is it manual bias? thanks Search " " across the entire site Search " " in this forum Search " " in this discussion. 70 lbs unboxed; Original price in kit form $159. To the point where you have to modify your amp to accept them in a usable bias range. A perfectly balanced push-pull stage will cancel all even harmonic distortion and sum odd harmonic distortion generated within the power stage. An EL34 tube has a recommended bias at around 320mv-350mv. Higher powers are obtainable with either very large power valves, or by using multiple valves in parallel, but beyond about 15W it is usual to use. In our case, we have just over 200V B+ to work with and we want to use a self-bias scheme, so our grid/bias voltage (the grid lines) plus the anode voltage (the horizontal axis) should add to about. byyou it’sloads KT88ofpower power amp valves, theyour. The EZ bias system uses LEDs so no meter is required. Vacuum tubes are an older technology not often used today, but they still show up in some amplifiers and other devices. In fact, a friend give me a spare matched quad of NOS (plain old) Gold Lion tubes + the needed output transformers so. the "Pig" from 1967 (thanx to and courtesy of Jacques of www. 5V, -1V, -1. Evatco was established back in the mid-1990's providing musicians, technicians and hobbyists with everything needed to build and maintain the favourite piece of musical equipment. Found 200 records in Search of SET Asylum. However, typically they are pragmatically assigned a significantly higher Grid #2 rating than for either tetrode or pentode connection. EL34 Review Chart (View our complete selection of EL34 / 6CA7 / KT77 vacuum tubes). Last Update: Description. Bias for that bank is set. When the grid bias is properly set, the tubes are balanced in the circuit and produce a clean, powerful signal. Original: PDF 1650F 1650H 1650K 6146B, 6550B 6L6GC 5881 tube KT88 kt88 tube kt-88 6a3 tube el34 tube 807 tube el34 6L6GC TUBE: ec 360 tube. Please make a Donation if you have them. Wide asortment and models up to 560 V. KT88 (6550 equivalent) Genalex GOLD LION reissue, new productionMATCHED PAIR: Looks and sounds like the 1960s vintage Genalex Gold Lion KT88, one of the most famous vintage power tubes in the world. Our meter display is LCD type and consumes very low power. Maximum power input to PT = 444. Technical and amp service information. Uses a bridge rectifier. Bias Settings For Safe Plate Dissipation - Class AB 70% Class A 90%. 5V, -2V, -2. You check the bias on the EL34s, swap in the KT77s and adjust to match, or a little hotter if you want. com over the years. It has been designed around the magnificent KT120, one of the toughest tubes available. This feature really makes the tester a joy to use in darker rooms. Set the bias-x to 0, and the bias all the way up. INRODUCTION: Meet the GMT One, a record player with more parts, more engineering and more technological innovation than it’s possible. In these calculations, 5% of the cathode current is assumed to be screen current. However, this is not. Marshall had to go with other tubes, like the 6550 or KT77 (and then even back to the good old 6L6). Kit builds one bias probe to be used with a multimeter (Get Yours Here). 807, 5881, el34, 6146b, 6550b, kt88 Notes: The above examples of possible combinations are to help you narrow down the choices of transformers for your favorite tube types. We have researched the proper grades to get the bias right where is should be with no bias mod. The pure tube design provides a smooth, almost liquid sound that has made this amp a reviewer favorite. the chassis is setup for 4 6l6 tubes. The tester works for all popular octal-base output tubes (6V6, 6L6, EL34, KT66, KT77, KT88, 6550, and more). If you need an analyzer which can test KT88, KT120 and KT150 and many others then this is One of the finest tube analyzers ever made. The sound was reproduced through a 1971 Marshal cabinet with 4 Celestion G12M "greenback" speakers. METHODOLOGY FOR XRF PERFORMANCE CHARACTERISTIC SHEETS Technical Branch National Program Chemicals Division Office of Pollution Prevention and Toxics Office of Prevention, Pesticides, and Toxic Substances U. Specially designed heat dispersion wings on the plate add more performance, stability and allow plate dissipation up to 50 watts. Actually the opposite, the ST100 is able to use 6L6GC, EL34, 6550, KT88, KT90 and KT120. I method I worked out to bias a Marshall EL34 100/100 Dual Monobloc Power amp using nothing more than multimeter i. METHODOLOGY FOR XRF PERFORMANCE CHARACTERISTIC SHEETS Technical Branch National Program Chemicals Division Office of Pollution Prevention and Toxics Office of Prevention, Pesticides, and Toxic Substances U. Due to many requests by fans of our Tung-Sol line of tubes, the Tung-Sol EL84/6BQ5 has been reissued. This list is our current tube type, location and bias points for all of the Dr. The 50Hz measurement was used for Lows, 700Hz for mids and 6kHz for highs. After winning the gold medal of『Music Player (¥120,000 to ¥200,000) Category ②』of the Fujiya-Avic Headphone Festival Award 2019 Spring in June, Cayin's N6ii has received another influential award of the year, the Best All-round DAP of 2019 by Headphonia. The chart below compares the distortion ratio at 50Hz of two mic preamps: a Dbx 386 and an AEA TRP. This was a “Question of the Day” post from Max in Stanhope, PA. Simply set the bias switch to bias, and turn the potentiometer until an LED in the bias section goes black, then twist the potentiometer exactly ^ turn clockwise. Tube bias of an amp is used to find the optimum setting for the flow of current in the tube when the amp is idling. I was told by Orange technician (UK) that it should be 18-22mA per tube (wherever it's 6550 or KT88). Due to the high current and power capability of these tubes, it is very important that the KT88 tubes are well matched. 70) Posted by The Bear on 2009-01-21, 16:27:18 (71. 7A 750mA 5AZ4 5T4 2. Full text of "BK: B&K 700 707 1975 tube chart" See other formats. 23 Watts For the JJ 5881's 14 watts for 6V6's 35 watts for KT88's and 6550's Example: 25 watts divided by 480 =. Uses a bridge rectifier. 40 and the amp made my HF section a lot louder. Line Transformers. Bias Settings For Safe Plate Dissipation - Class AB 70% Class A 90%. Some of the new prod kt88's pull a boatload of current to power the heaters. Power tubes like EL34's and KT88's are good for about 2500 hours or more. This information is for reference only. A Stock 3444 can not read these tubes for plate current, this o. Latest: What are you listening to right now and on what speakers squirrelnest, 12 minutes ago. This was a “Question of the Day” post from Max in Stanhope, PA. EL34 handled lots of power in a small envelope. For the tubes, I decided to use some KT88. The same process is true for EL34's , KT66, KT77, KT88, but the numbers will be different according to the maximum power the valve can handle. I just did some tube swapping on my Thrasher 120 and am now running 6L6's and KT88's in the power section am very pleased with the results. Rotate all four bias adjust controls located on the rear of the chassis (V7, V8, V9 and V10) fully clockwise for maximum bias. KT88's or 6550 tubes will last longer in an ST-70 than EL34 tubes. AMPLIFIER KT88 SERIES ORION II Integrated amplifier; 2x50W Pentode or 2x30W Triode - switchable, 4x Ayon KT88s, 3x12AU7, 0dB NFB, 3 x Line-In, 1x USB-In, 1x Pre out, 1 x Direct in, RC, Auto-Fixed-Bias system& Tube test program, PPP; N E W € 2. The rig as far as the power supply is concerned was solid stated and the audio driver transformer was removed in favor of a phase splitter. Chart rolls easily no visible date. t = Triode Unit. To keep the math simple, lets assume an output tube is supplying a 100 volt ac signal to the primary of an output transformer with a 10:1 winding ratio, and the secondary is feeding a 10 ohm voice coil. Stemming from over 6 decades of innovation, the latest Dynaco amplifiers and preamps deliver music with the dynamics and excitement that is only possible when mixing chemicals inside a glass tube. BIAS ADJUSTMENTS:. I method I worked out to bias a Marshall EL34 100/100 Dual Monobloc Power amp using nothing more than multimeter i. Bias Settings For Safe Plate Dissipation - Class AB 70% Class A 90%. 807, 5881, el34, 6146b, 6550b, kt88 Notes: The above examples of possible combinations are to help you narrow down the choices of transformers for your favorite tube types. Potenza 2 x 50W su 8 ohm. Rectifier Tube - 5Y3. A defining attribute largely responsible for the 5150 sound is the fixed bias, set to a lower value which resulted in the Power Tubes running at a lower energy commonly known as "cold-biased", resulted in a more controllable gain setting, allowing such a heavy amount of gain to be applied without sacrificing tonal definition. The EZ bias system uses LEDs so no meter is required. The tester works for all popular octal-base output tubes (6V6, 6L6, EL34, KT66, KT77, KT88, 6550, and more). There are two reasons for the specified value of the grid resistor under the two different operating conditions - one that is described in most comprehensive texts about valve amp. 40 and the amp made my HF section a lot louder. KT88 - Kinkless Tetrode Power Tube - The Tubes that made Rock 'n' Roll - Power Amplification Tags: vale, poweramplification-marshall, stack, power, amplification Available in Plus Size T-Shirt. As in its other amps, PrimaLuna's Adaptive Auto-Bias circuitry is used to monitor power-tube performance and eliminate the need to buy tubes in matched pairs. METHODOLOGY FOR XRF PERFORMANCE CHARACTERISTIC SHEETS Technical Branch National Program Chemicals Division Office of Pollution Prevention and Toxics Office of Prevention, Pesticides, and Toxic Substances U. Chart properties provide many ways to customize chart appearance. The Electro-Harmonix 12AT7 preamp vacuum tube presents a clear, uncolored tonality with a very strong amount of signal gain. Have you ever wonder what the difference is between each of the 6l6 tubes, have a quick look at this chart to help you see what the differences are as it just might help you choose. They are scanned into my computer, all of the stray lines, dots, etc. The negative grid voltage method: This method involves measuring the DC voltage on the grid of the output tubes, and setting it to a recommended value. Any suggestions for correct settings will be much appreciated. The EZ bias system uses LEDs so no meter is required. Later in the 1970s, EL34 tubes became hard to get. About 50 ma is right when in an ST-70 which is. EL84/6V6GT - 12W. Tube Brand / Electrical Ratings. i for now want to use a 12ax7 since there is a 9 pin socket already. However, guitar amps rarely use matched valves and usually have a less-than-perfect phase inverter. 48-Month Financing** Open quick view dialog for Fender Blues Junior IV 15W 1x12 Tube Guitar Combo Amplifier. Of course, there are the usual 6V6, 6L6, EL34 and EL84, but Bias Amp 2 adds additional tube models, the 6550 and KT88, which provide the drive for many classic amps. 6CA7 was not a copy of EL34, it was a design of its own. As mentioned, this amp uses KT88 output tubes. simms-watts. Hi, and first of all, congratulations for this nice blog that I just discovered. Probably more than the MM transformer can handle. This is sick, beacue I don't know what's going on. If you want to compare only two tubes, you can input “2” for the C and D tube to hide tube C and tube D. How you operate the tubes (push-pull, push-pull parallel, ultra-linear, class, B+, bias, operating points, etc. 36W Voltage Chart EL84 V7 V8 EF86 V9 36W EF86 Voltage Chart Plexi 100 Watt EL34 HT Plexi 50 Lead JTM45 KT66 B+ TrainWreck Express PPIMV (tested on Twreck Xpress PPIMV 120V - 11/12/06) Bias For PPIMV 38-40 (tested on 18W tremolo 240V - 21/12/06) EZ81 18W Tremolo - Tremolo Off 18W TMB (tested on 18WTMB 240V - 15/01/07) B+ = OT CT = 328 OT CT. You can also make a 5W mono amplifier out of it. 4 TRANSFORMER MATCHING. WEBER BIAS SETTINGS. Small signal tubes with numbers like 12AX7, 12AU7, and 6922, and rectifier tubes like 5AR4 may go 10,000 hours. De-bias button is pretty cool idea (well, in both means lol). Title: KT88 Author: M-O Valve Subject: JA-FP-2000-10-01 Created Date: 10/1/2000 7:35:29 PM. Rectifier Tube - 5Y3. Bias tools etc. 5 watts So, 24. Audio Transformers. The module doesn't "know" is if it's adjusting the bias on a 6L6, 6550, KT150 or any other tube. That would mean 54 mA per tube. The numbers here are WATTS at various frequencies. The calculator will give you the bias current for each tube. The other tester we use is a New London Instruments Model 901A Transconductance Analyzer. The pentodes Hegeman chose were 12BY7 video pentodes. Power Tubes - EL34 STR 450 Siemens NOS. Substitutes: 6550, 6550A, KT90 Type 2 or 3, KT99, KT100, KT12O/KT150 (only if sufficient bias is present) Though your manufacturer may have settled on a certain brand of these, the hunt for cool NOS types may be sonically worthwhile, or try switching to EH KT90s or bigger for more impact. Stemming from over 6 decades of innovation, the latest Dynaco amplifiers and preamps deliver music with the dynamics and excitement that is only possible when mixing chemicals inside a glass tube. A tube manual or tube manufacturer's technical data sheets should be consulted first, before making a decision on a proper output transformer. A small Fender amp with one 6V6 and 3 watts is operating in class A. This tube is a drop-in replacement for KT88s no special re-wiring required! The KT120 is rated to have a plate dissipation of 60W compared with the 35W of the 6550, the 42W of the KT88, that's a lot of juice! The KT120 also draws more filament current from your amp's output transformer(s). It is a single ended class A amplifier and features a Custom All Tube Guitar Amp Cascode 12ax7 Push Pull 6v6. Tubes supplied by www. electron Tube Data sheets - Type index. So heat it up slowly, pack it carefully, do not drive the amplifier in full distortion, just for the fun of it. Built in “Easy Bias” Meter Hand wired point to point Class A, Triode front end. Original power tubes in this amp are 6CA7 but the owner likes to use KT88 and use it for bass. Posted on May 5, 2015 May 8, 2015.
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