http://www.bonavolta.ch/hobby/en/audio/el34_7.htm
Tring to find as simple as possible with enough power.
Tring to find as simple as possible with enough power.
It's not "simple as possible." But it's not horribly complex or challenging, either. The big problem will be finding that output transformer- if you substitute a different one, all that fancy compensation circuitry will have to be changed out, a very non-trivial task for a beginner. The second biggest problem will be duplicating the layout of the original so that stray capacitances and inductances don't upset that compensation.
If you want something simpler, clone a Mullard 5-20 or an Eico HF87.
If you want something simpler, clone a Mullard 5-20 or an Eico HF87.
I'm 95% complete on a Mullard 5-20, it is a more straightforward design than the one you are considering.
For me as a beginner I think it was a good choice. It's an old circuit & there's stacks of information available in books & on the web. Just refer to it by name & experts abound.
Eduardo
PS - SY, like the new, less disturbing, picture!
For me as a beginner I think it was a good choice. It's an old circuit & there's stacks of information available in books & on the web. Just refer to it by name & experts abound.
Eduardo
PS - SY, like the new, less disturbing, picture!
You can also have a look at this amplifier:
http://www.lundahl.se/claus_b.html
It's a modified Mullard 5-20. Very simple and easy to build, and the description of the modifications are very good.
http://www.lundahl.se/claus_b.html
It's a modified Mullard 5-20. Very simple and easy to build, and the description of the modifications are very good.
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