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Old 14th July 2005, 06:06 AM   #1
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Default Is this a good choice for El34 PP

http://www.bonavolta.ch/hobby/en/audio/el34_7.htm

Tring to find as simple as possible with enough power.
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Old 14th July 2005, 11:19 AM   #2
SY is offline SY  United States
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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.
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Old 14th July 2005, 12:24 PM   #3
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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!
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Old 14th July 2005, 12:30 PM   #4
SY is offline SY  United States
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Quote:
Originally posted by eduardio
SY, like the new, less disturbing, picture!
I'll have to work on that.
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Old 14th July 2005, 03:03 PM   #5
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Thanks, I will search around for those two and see what I can find.
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Old 14th July 2005, 06:52 PM   #6
nilrog is offline nilrog  Sweden
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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.
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