Single ended guitar amp schematic. This is the schematic for the power supply.
Single ended guitar amp schematic It has a nice 12" Jensen that should sound awesome. The 470 ohm cathode resistor sets bias at a 75mA which is only about 68% of the maximum plate dissipation so expect long tube life with this amp. I built a twinamp style tweed cabinet somewhat modeled after the 1959 Fender Twinamp but scaled down slightly to have 10 inch drivers instead of 12's, and built up a new chassis with a newly brewed EL34 single-ended 10 watt circuit. The schematic for the J. Back cathode biased amp shares the same general layout and chassis as our single-ended 2A3 project but the output stage uses a single triode-strapped EL34 per channel (see the 100 ohm resistor connecting lug 3 and lug 4) rigged to the 2. Found plenty of ultra linear Hi-Fi KT88 designs, but not much for single ended guitar with KT88. PRE ANALYSIS / DESIGN A. The power amplifier involves three stages, two of which use a 12AX7, and the last of which runs through an EL34 pentode tube. I thought that a nice single ended UL 6V6 design should be just about right. The occasional peaks of screen current in music won't average out to much, but instrument amps are different. The screen Gibson. Either 6V6 or 6V6GT pentode tubes can be used in the output position. FETs for tube-like sound. ACA is starter amp This amp was designed and built with several different goals in mind. GA-15 Maestro, 14W Amp. C. I estimate the DIY guitar practice or PA amplifier. Dual rectifier, dual Class A single-ended cathode biased output tubes. I used salvaged transformers purchased well below online prices and 807 tubes which are still reasonably priced. The original schematic has a 250 Ohm resistor here. This is a small space, about 8’ x 10’, so I didn’t really need lots of power. The amplifier section is generally the same as Mikael's, with the main change being that the cathode resistor on the output tube has been increased from 470 ohms to 560 ohms. Gave single ended amps some though, checked some of the existing ones on the market. June 25, 2012, 01:41:02 pm » Hello all, I've recently gotten into guitar amp building and design, and would welcome any advice or suggestions for this latest attempt at a schematic. On russian forums found simple schematic of single-ended amplifier with 6N3P (6H3P) and 6P14P tubes. V2 - 50C5 - output stage. Registration will only take a minute and registered users do not see any advertisements. Back Figure 2: 50EH5 Single-Ended (SE) Typical Operation Schematic. The number written in pencil are the voltages measured in my kit. The amplifier circuit is very straight forward following the basic application notes. 1 1 2 2 3 3 4 4 5 5 6 6 D D C C B B A A Title Size Number Revision A3 Date: 21/6/2011 Sheet of File: C:\Users\. Having listened to push-pull amplifiers all along and very satisfied with the sound quality, because to me a tube amp sounds like a tube amp no matter what, I decided to try to build a single ended tube amp. This instructable will show you how to build a vacuum tube amplifier using parts salvaged out of old electronics and 2 purchased vacuum Manifesto SE a single ended tube amplifier project by HB. The power supply is a LOW DCR "flywheel" type with 250VA Hammond ICT as the main B+ transformer. Choose a good quality audio output transformer with a 5k primary and rated for at least 10W. Most seem to have ratty characteristic to their sound, especially when pushed above 5 on the volume, most sound boxy (which I attribute to smaller cabs and some times 8"-10" speakers). F1J is my favourite, its still single ended, even it is balanced. One of the key features of the Fender 5c1 schematic is its single-ended class A design. Schematics with ideas for easy, single-ended amps. So I grafted the same circuit into my twin 6V6 and twin 6AQ5 single ended amps to see what benefits I could get. Figure 3 shows The Tube amp Library of information Click the link above for Tube amp info, Schematics, Board building information, Projects, Mods, Transformer diagrams, Photo's, Sound clips. com Open. 1uF Single-Ended 807 Tube Amplifier I have stated in the past that my mate Don makes an amp a month. These being common valves made by BEL is another reason that I decided to go with this circuit. The preamp/driver is a 7199 with the triode as the input gain stage. DIY Single-Ended KT88 / 6L6 / EL34 / 6CA7 Tube Amplifier Click to expand The cathode resistor determens the tube current. Figure 1: Single-Ended (SE) 6L6 / 5881 Vacuum Tube Amplifier Schematic. So depending on your room This amp replaced the BR-9. F3 is another great sounding amp, with cap on output. Schematics amplifier circuit schematic electroschematics El84 single ended 12ax7 circuit stage simple kit output eq using pcb Guitar amp amplifier schematics electroschematics result robe Jean Hiraga's single-ended KT88 tube amplifier schematic with 12AX7 (ECC83) tube input stage. I wrote the schematic out in the style of the Fender champ 5C1 because I wanted The amplifier schematic is very similar to the one I used for my very first tube amplifier. Single Ended Tube Power Amplifier. Mikael Abdellah KT88 Single-Ended Tube Amplifier Schematic. This Single-Ended (SE) 6V6 and 6V6GT Tube Amplifier Schematic is from the book Build your own Audio Valve Amplifier by Rainer zur Linde. Nelson, single ended, just search First Watt web page. Pspice Spice simulations are a valuable tool that aid in the design of tube amplifiers. This circuit looks like a complementary amp, but isn't! In fact, our chameleon is a single-ended (SE) amp with a dynamic load. GA-14 Titan, 14W 1×10″ Combo. I am not even using any feedback in the circuit. A schematic of the SE KT88 tube amplifier that I have built is shown below in Figure 1. The schematic is from the book "Build your own Audio Valve Amplifiers" by Rainer zur Linde. The tube amp sounds really nice and it amplifies music and guitar really loud. This instructable will show you how to build a vacuum tube amplifier using parts salvaged out of old electronics and 2 purchased vacuum tubes. The goal was to create a 36W solid-state output stage with a Re: single ended 6l6 help Post by Zephedone » Fri Apr 18, 2014 1:38 am Sorry guys I forgot to note on the schematic that V1-A gets plate voltage from the last node of the power supply . This is the schematic for the power supply. A combo amp featuring reverb and tremolo, The Regal is a pure, single-ended class A design that utilizes a new ‘Adaptive Transformer Technology’ that allows for the use of one or two power tubes at the same time. \6L6 SE Amplifier Schematic. Attached is the schematic for the modified "hybrid" 6AQ5 amp. SchDDocrawn By: C2 0. DIY Single-Ended Ultra-Linear 6V6 Tube Amplifier. I salvaged everything from a HMV radiogram, circa 1959, it came as a single ended 6V6gt, I had half of it made into a Fender Champ clone guitar amp, using the Goodman speaker that came from the radiogram as well, I still have the chassis, half the tubes, the power transformer with the huge choke to make the beginnings of the 6V6gt set amp, stereo, class A This schematic is copied due to copyright, but most of it is the circuit designed by him. The single-ended (SE) power output stage is the simplest form of power amplifier. I have the amp in a birch open backed cabinet with a Weber signature 10 speaker. Once you do the math on all the components I ordered from Angela, the Komboking chassis, Weber speaker and used cabinet I bought this was an expensive amp. While the 50EH5 Single-Ended Typical Operation Schematic shows an output transformer with a load resistance of 3K, the 50EH5 Datasheet indicates that a load resistance of 2. I had all components and started to build it. KT88 SE Stereo Amplifier – Hand Wired Dimensions: 18. Amplifier. I won an impromptu local "shootout" with this. This amplifier combines the simplicity and fidelity of SE design with easy-to-acquire parts. but normaly will be get 8W rms by penthode DIY 6V6 SE-UL Tube Amplifier Schematic - Lacewood. I bought a Caliphone record player recently and pulled the mono SE 6BQ5 amp out of it to make a low power guitar amp. Amplifier & Power Supply Included in this 10+ page PDF are schematics and a parts list for both the 5F2 circuit (and advice from Steve on parts) along with the schematic and tips for Angela's own "Super" Single-Ended amp project: A louder version of the Single Ended 6l6 Guitar Amp Schematics Anyone? I've been thinking about a funky new tube project, and while a 5f1 fits the bill just fine, I'd like to mix it up. Single-ended class A amps were used in many lower power 1950s-60s Fender Tweed and Blackface amps and in Vox's AC-4, which also used the EL84 tube. Are you having your Silk Audio transformers Guitar & Instrument Amp Schematics; Hi-Fi Schematics; Single Ended 6K6 Amplifier – a Gift! Built for my Mother-In-Law as a Christmas gift! This little amplifier has a headphone jack and volume control up front, speaker terminals in the back, and a power switch with blue LEDs. Well, the little amp I bought to convert has a single ended 6AQ5 instead (just arrived). I built this amp 15 or so years ago, when silver signal wire was a thing. I need a bit of help, though, figuring out splicing the preamp from the Plexi 6V6 into a single-ended EL34. It uses a single 6V6 power tube and a 5Y3 rectifier tube, which gives it a lower power output compared to other Fender models like the Deluxe Reverb or the Twin Reverb. Schematic. Many articles have appeared regarding projects using one of the most sturdy, versatile, and trustworthy audio tubes ever made — the 6550. Basically, it consists of two preamp stages using one 12AX7/ECC83 and a single-ended output stage using EL84. My single Ended EL84/6BQ5 guitar amplifier build (Schematics & LTSpice simulation in post) Parts & Construction Finished my build today. The filament supply is regulated at 6. It is basically the same as an ordinary gain stage, but instead of a load resistor we use an output transformer. This is one of the simplest (and nicest) project i've ever made. It is a single-ended amp with one power tube. The two triodes in the ECC83 (12AX7) are connected in parallel to obtain a low Single-Ended 6550 Tube Amp Schematic with 12DW7 Driver Stage. Sort by: Aliexpress has a few stores that sell this amplifier with that schematic/build where you can swap out stuff The power section is based on an Allen class act, as that was the only single ended EL34 amp I've seen a schematic for. I hope the preamp sounds decent, though. Registration is free and required to post messages and view the file attachments. 2K OPT that should work well. What I decided on was to build a single-ended Fender 5F2-A Princeton Amp with the resistor and capacitor values from a 1957 Gibson GA-5 Skylark Amp. However, in your schematic you show 320-0-320 through a pair of 1N4007s yielding 382VDC This is the classic single-ended EL84 schematic from Mullard. Welcome to the DIY Audio Projects Message Forum. The color, a light textured metallic blue, is a new color for Figure 1: 6T9 Single-Ended Tube Amp Schematic. 5 inches wide by 12 inches deep by 8 inches high Weight: 33 pounds Our KT88 SE Stereo Amplifier has lower distortion than a SE triode amp. el34 bugleboy SE amp schematic. his EL84 I'm getting ambitious and want a winter project for after Christmas. Morrison 300B Single-Ended Vacuum Tube Amplifier is shown below. It's designed to be easily built by a begining builder. First thing that had to change was the cathode resistor R1. The power supply uses a 5U4G tube rectifier and a C-L-C filter. A 12DW7 or 7247 is used to drive the output stage. Your tube rectifier should help you in this regard. This amp uses an EL84 (6BQ5). It had a "mic" input with a suitable gain stage for the guitar. The amp uses a 6X4 tube rectifier. I will be happy with bigger power. Previous post 35W Tube Power Amplifier with EL34. The amplifier section is generally the same as Mikael's, with the main change being The design chosen for this project involves a single ended audio amplifier, which consists of a resistive input network, a driver stage, and an output stage to a typical 8 ohm loudspeaker 12AX7 tubes. It's a simple low wattage KT88 Single-Ended 1. For simplicity & aesthetics I prefer diode rectification in the power supply. EF86 is intended to be used as an instrument amplifier tube with exceptional high gain or as phono preamp tube. The quality of the audio output transformer (OPT) will have the largest effect on the sound quality. This is a low power Guitar tube amp suitable for practicing, recording or miking through a PA system. Power 6W. Power 10W. Schematic by Jean Hiraga, published in L'Audiophile 14 (January 1980). Tube Amp Library: Tube Amp Schematics library: Design a custom Eyelet or Turret Board: DIY Layout Creator File analyzer program: DIY Layout Creator File library: Transformer Wiring Diagrams: The Angela Super Single-Ended amp uses two rectifiers and and two single-ended 6V6 output tubes, with a single 12AX7 preamp. I use it with balancing trafo on the input, since all my signal chain is not balanced. The 470 ohm cathode resistor sets bias at a 75mA which is only about 68% of the maximum plate dissipation so expect To see his build, visit the DIY 300B Single-Ended-Triode (SET) Hi-Fi Amplifier project page. There you can use that lot of gain. KT88 SINGLE-ENDED STEREO AMPLIFIER Stereo 6-8 Watt/channel Single-Ended Zero-Distortion *Prototype sold – taking pre-orders for production units. I don't know what it is, but it is not a 6V6. The Tube Amp Schematics Library Well, after having aimed too high with an 845 Single-End, followed by a 300B Push-Pull, I concluded that I'm too much of a novice to be building such designs, so for my first ever tube amp project, I have decided to start small and easy. This amp is designed to provide high quality music for an office or small den. Share Add a Comment. Our amp uses two Radio Shack IRF510 MOSFETs. Most of them show these audio beauties used in the push-pull configuration in order This amplifier was built on-the-cheap. The preamp circuit and features are similar to those on a Fender Tweed era One of the advantages of a single-ended amp is the low parts count, which means simplicity. As a starting point, I've used a B+ similar to that of the Clubman, which seems to be in a pretty standard range for EL34s, though I am wondering if I should consider a lower voltage, esp for a single ended class A design A schematic of the SE KT88 tube amplifier that I have built is shown below in Figure 1. For triode mode (making it SET, or Single Ended Triode, as advertised ;) you However as part of that development I put a single stage FET front end on it and I was pleasantly surprised by the smooth breakup that the FET created. The first was that I needed a small amp for my work/listening area. There are hundreds of pages of Tube amp information on my library page. Now it's personal! How it was done: Single-ended pentode mode, with Mikael Abdellah KT88 Single-Ended Tube Amplifier Schematic. 6J7, 6F6, 5W4 single ended amp 07-07-2008, 03:08 AM. Figure 3: 50EH5 Tube Power Supply Schematic. I recently built a 5F1 head amp using leftover parts and iron I had on hand and noticed I had iron that would suit the 6K6's I found in my tube stash. I would think this is good, since this is a popular tube here. The use of a single tube in the output stage of I built a Decware stereo single ended sv83 amp. Single-ended amps are usually fairly low power (less Figure 1: 6T9 Single-Ended Tube Amp Schematic. So depending on your room Mikael's KT88 amp that Arnold mentioned (and that I have built and use every day) is a single-ended amp. If single-ended is OK for your needs then I can highly recommend that schematic. Does anyone have a schematic for a simple single ended guitar amplifier using a 6K6 output tube? I have a PT, and a 9. The Fender 57 Champ Schematic is a classic single-ended guitar amp design, known for its simplicity and warm tone. The second goal was to test a hypothesis. The two main types of output stages for guitar amp use are single-ended and push-pull. The 6V6/GT/GTA all have the suppressor (or beam plate - depending on manufacture) internally connected to cathode. Mullard Single Ended (SE) EL84 Tube Amplifier Schematic. This amp works great for rehearsal, small venue use, and especially studio The EL34 World Tube amp Library of information Click the link above for Tube amp info, Tube amp schematics, Tube amplifier circuit board building information, tube projects, Amp mods, Tube amp transformer diagrams, Photo's, Sound clips. There are many other from Mr. Any ideas for a single ended The Big Review: Silktone Amp KT66 – single-ended but many-voiced, is this the ultimate compact Class A tone machine? Packing a single KT66 output valve, this American boutique combo promises top-quality sounds both clean and overdriven along with some smart extra skills. Here you are the final schematic: 1955 schematic for a 3W stereo single-ended tube amplifier based on the EL84 tube and Mullard 3-3 design. You can use EL-84's if you like but I prefer the russian 6p15. Using audio output transformers with a primary impedance of about 3000 to 3500 ohms you can expect about 8W of output with at about 2. I recently picked up 3 Webster Electric intercoms from the late 30's (I believe) also told me that the internal speaker is 50 ohms which means that the output transformer will likely be all wrong for guitar. After you have completed the online registration process, check your email The Bluesman by Bob Richards EET, 2007. All my audio projects I worked with were single ended triodes which puts out 2watts maximum. I took a short listen and thought it OK but a much longer review is required. Anyone have a schematic or thoughts on doing a little single ended 6l6 amp? Also thinking about going with a solid state rectifier this time around, but I haven't settled on that yet. Most every guitar amp uses 470-1K wirewound resistor for screen(s). In Narrow Daylight guitar makes a delightful dialogue with singer , with each of its strings coming neatly with one perfect balance between smoothness and fidelity Mini sound EL84 amplifier . By understanding the schematic, guitarists and technicians can gain valuable insights into how the amp produces its signature sound. Chameleon. This means that the amplifier uses a single power tube, typically a 6V6, to amplify the signal from the guitar. Historically, these early amps had smaller output transformers that saturated magnetically when the amp was fully turned up – giving nasty, harsh, buzzy distortion, and also did not maximize Schematic for a Single Ended Tube Amp 12AX7 + EL84 Power Amplifier imgur. Thread starter lexx21; Start date 2020-10-01 6:42 am; Jump to Latest (you will need horn speakers, or a more powerful amplifier than a single ended EL34 amp). Next post Stereo Electret Mic Preamplifier. 5 to 3K is suitable for single ended operation. Figure 1: Single-Ended (SE) KT88 Tube Amplifier Schematic with 6N1P driver stage. In looking at most single-ended plexi designs, the master volume is directly in front of the EL34. (µ/ý XÄe ¸œ 1°j¬8 ¶³é ®-×c`- w m$É( xˆ ·ìN£!¿§«½! Fò þ)ý‘ Š ú Ý ¨èÈŽCo¼ ¤` ¢2¡L¨ŠC¥"™4P ¨ˆƒÍˆrlº º0 ×s¨£A‘ {–å÷ Ú*;†Ïš ¯ =ë óÚ+° ®ç ò9lÿyî ›Œæ ìä£} š†+´G»1Ì i!š0P ’I$ i®4¤ÞJã—SæhK7\íŒHH€2” ” J „º!m5µ× ¸q£+Pp a‚’ŠðÜV9b îG³ The output stage is a single-ended class A power amp. And now I want to try A simple Class A Tube Amplifier. Figure 2: 6T9 Tube Amp Power Supply Schematic. Thanks Paul EL34 Single-Ended 3. Download 1955-1A schematic in PDF. It used a 6SJ6 pentode on the input, two parralled 6V6 tubes as a single ended power amp and 5Y3GT rectifier. 5K ohm primary tap I've been working on similar single ended designs. EL34/6L6GC UL Mini Single Ended Amplifier's schematic replaced power transformer more big one finally connected as Triode with EL34, KT88/6550 sound like EL156/KT88 SE Amplifier triode connection. 🙂 I found a schematic for a 6BQ5 Single-End stereo design which seems straightforward. This month Don has completed an 807 amp based on a schematic designed by Matt from the USA and the same as I built a short time back. com. The main difference between the two types is in the connection of the tubes to the output transformer, and the type Hello guys, Imlooking for a good single ended EL84 schematic. For those of you who want to have the warm sound of a vacuum tube amplifier, when playing guitar or just listening to music, but cannot afford to buy an expensive tube amplifier, this instructable is for you. The circuit is so simple I use it in my How Tube Amps Work webpage. Full size 6T9 Tube Amplifier Schematic - (PDF 33kB) which is not entirely unexpected for a small and simple single-ended (SE) tube amp. They're in pair beacuse i've a separate supply for each channel, so every amplifier is completely indipendent. It was a winner at a recent I recently posted seeking ideas for a single ended 6BQ5/EL84. SINGLE-ENDED CLASS-A TUBE AMPLIFIER – AUG 10, 2007 5 E. It uses two 6V6 tubes in a single-ended (SE) ultra-linear (UL) configuration with a warm 6SN7 driver to give great music quality. The schematic I used is the one shown on th Angela site. I am curious, I might be interested in the Silk Audio transformers. An understanding of the dangers of electricity is required to build this amp, but it has been successfully built by a number of people with no previous amp building experience. Because it is single-ended, there is no need to use a phase inverter. Keep this in mind when choosing your first build, anyone can piece together a complex amp. By using Schematic for the amplifier, omitting power supply II. . Jean Hiraga's single-ended KT88 tube amplifier schematic with 12AX7 (ECC83) tube input stage. 2W Tube Guitar Amplifier, 12AX7 & 12L8GT Single Ended. This amp was introduced in 1955. The Input Network The input to the amplifier uses a resistive gamma network. There has been another birth in the family, The Bluesman. Shahzad on Bass Guitar EL34 Single-Ended (SE) Tube Amplifier Schematic (EF86 input) Single-Ended (SE) EL34 Tube Amplifier Schematic with EF86 input stage. It seems to me that I could use the Hoffman 6V6 turret board and modify it slightly for a single-ended EL34 instead of the push-pull 6V6s. Using [6] as a guideline, the Simplicity & Fidelity . 5% THD. Therefore, operating power is rated from 5 watts to 35 watts; and at 5 watts, it’s a REAL 5 watts, not some squashed Single-Ended 6550 Tube Amp Schematic with 12DW7 Driver Stage. The schematic needed a bit of modifications to fit my needs. Sounds great after some finetuning. It is based on the vintage tube guitar amps of the '50 and '60s by Fender, Marshall, etc Here is the schematic: There's no better guitar amp to start with than the Fender 5F1 Champ. The input stage uses a EF86 to drive a Mullard EL84. The power supply is solid state. Punch for Practice. I may use a tube diode for the doubler, but I kind of Single-Ended (SE) 6V6 and 6V6GT Tube Amplifier Schematic. Very good sound with the right transformers and quite easy to build. Biased for 30mA (at least as I recall; the schematic shows 21mA, that seems low), wired for pentode mode in the schematic. Single-Ended (SE) EL34 Tube Amplifier Schematic with EF86 input stage. el34 bugleboy SE amp schematic . Solid-state. These terms refer to the amplifier output stage circuit "topology", which is the way in which the components in the output stage are connected. 3V using a LT1085 voltage regulator. EL 84 /2A3 Single Ended Amplifier from Germany. See 300B Single The P1 is a simple tube amp modeled after the classic small guitar amps of the 50's and 60's. el84 se schematic, el84 single ended schematic, el84 tube amp, el84 tube amplifier, tube ampifier Post navigation. With a number of different KT88 tube amplifiers we have had good results using new production JJ KT88 Blue Glass and Genalex - Gold Lion KT88 tubes. Output power will be about 5W. very clear but output this amplifier Single Ended may use with 6550, KT88, EL34 and 6L6GC( 1/4 of power of penthode c) DIY 6V6 SE-UL Tube Amplifier Schematic - Lacewood. matt h I meant that 1K resistor as the screen grid resistor . Mikael use 560 ohm giving 70mA,I proposed 330 ohm for 90mA giving a little bit more power. In an amp that needs only 8-15V to drive the output tube and a high input source voltage youll end up with a hard negative feedback circuit like all the last generation studio amps that used this tube. I was searching for single-ended amplifier schematics—tube-based single-ended amplifiers—when I encountered the following circuit in my huge stash of SPICE circuits that I have created over the last twenty years, which is a super-triode design that holds triodes and transistors. Power Supply. Author Topic: Advice on Low Wattage, Single-Ended Amp Schematic (Read 9971 times) 0 Members and 1 Guest are viewing this topic. I suggest it to all the first-time DiYers In my opinion, Its main advantages are: low price and good quality; components easy to find; easy Schematic Diagram E34L/EL34 Single Ended Amplifier Note:EL34 single ended amplifier will be get 10W rms by good condition of power supply and good Audio Out Put Transformer. Output Transformer: Air-Gapped Hammond 125 ESE This is a single channel amplifier (mono) of course with single input and single output. Here is the main Schema. For more information about tube based power supplies, see the article Power Supply Design for Vacuum Tube Amplifiers. 7 watts per channel. I've found it difficult to source PTs that can supply the juice needed to run two 6V6s without vastly exceeding their plate voltage. It has only 26 components but sounds fantastic. I already have the acrylic plexiglass for the custom chassis and have begun assembly, and now I'm looking for a good schematic for a single-ended EL34 or KT88 stereo amp. You can get a circuit board from them or you can build it point to point. The physical layout is breadboard-minded, with exposed signal circuits connected to the power supply via umbilical connectors. Schematic by Michel Leluaux from "L'Audiophile" (April 92). I just realized something!! In the circuit that I referenced in my OP, Single-Ended (SE) 6V6 and 6V6GT Tube Amplifier Schematic, the output tube referenced IS NOT a 6V6 of any variant. The single-ended amplifier circuit uses a 6550 high power tetrode vacuum tube in the output stage. Another similar schematic is available in the 6550 amps section. Leave a Reply. Recently added speaker/headphone switch and headphone jack. Use these forums to discuss Hi-Fi audio and to share your DIY Audio Projects. The circuit of this amp is identical to that of the GA-6 Lancer and the Epiphone EA-30 Triumph amp. This parts list provides the manufacturer and part number This is the classic single-ended EL84 schematic from Mullard. The 12DW7 / 7247 is a dual section triode, the first section has a gain factor of 20 and the second section a gain of 100. The power supply uses an EZ80 (6V4) tube rectifier. The saying, “the [] LM391 Guitar Amplifier Circuit - ElectroSchematics. The maximum rated power output is about 4W with only a Watt or two of good output. Please visit my Tube Amplifier Forum Here's the place you can go to ask tube amplifier questions. nysho zhnpr pvnlir srufejv berrd zeleo rmwkvfl yqfeuqy xlnbxchi gvjc