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SET EL84 tube amp DIY project
Submitted by costas sarris on Thu, 31/07/2008 - 10:58.
EL84 single ended Tube amp DIY project by costas sarris (2002)
This project based on Decware EL84 Zen Amp
Making a low power single ended amplifier has always been in my designing plans. Obviously such a construction requires the appropriate speakers, particularly horn type designs, so that the output of the amp can reach an efficiency satisfying level.
Once at a certain point, I came across the designs of the Decware SE EL84 Zen amp, which had quite good reviews among the tube amps DIY and Single Ended tube amp builders.
This simple and clever design was exactly what i had in mind. The most convenient way to develop my idea was to use an already existing design.
Tube amp diy
Chassis are made of wood, and i build the whole construction in an aluminum plate (3mm thick). All parts are mounted on the aluminum plate. Finally i coated the aluminum plate with plexi glass (dark gold)
I ordered the output transformers in a local workshop, (Greece / Thessaloniki). All tube sockets are porcelain, and all the critical paths wired using silver-teflon cables. I also used metal film resistors, and WIMA capacitors.
The whole circuit is very simple. It is a common cathode design with the 6922 tube driving the power stage with el84. I changed only the two cathode resistors (150Ω /8 watt) with heavy duty type for heating resistance. In the Power supply I used the 5U tube for rectifier according to Decware manual.
You can find EL84 and svetlana SV84 tube data in tube data pages.
Listening the tube amp
(back in 2002...)
This simple EL84 tube amp meet his first "crash test" when we put it in the same rack with the GRAAF GM20. We connected it with George's Valmas Coherence II Jeff Rowland pre amp, and we used George's Amati Homage loudspeakers.
Clear voices incredible solo's unbelievable mid and high - frequencies ! absolute separation and purity not expected! But .... we needed POWER !
If you have horn loudspeakers in your living room then its time to build this EL84 tube amp... "monster" because ... sound does matters !
costas sarris
acknowledgements :
- Decware Zen EL84 Amp
- George Valmas for his effort to listening tests
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Hello, I think I finnaly
Hello,
I think I finnaly have the time and space to make a valve amplifier. For my mainden project I need something simple. I was thinking of a mullard 3-3 remake or Sams 5 w design. http://circuitdiagram.net/5w-tube-amplifier-with-el84.html No question of 300Bs or expensive valves that may be blown to pieces when I toggle to ON. Your project looks even simpler. I like simple things. «Less is more». Would you advice this circuit to a newbie? Any advices?
Thanks,
Rui Duarte
Rui in my opinion this is a
Rui in my opinion this is a good and simple project, a good start for a newbie. This is a low power but unique quality amplifier. Proceed with the project and if you need any help let me know.
costas
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