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Pure valve to hybrid audio applications, with some digital techniques as well, something for every one, that's my goal!
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ECL86 SE-Amp, the easy way...

Posted 23rd November 2009 at 08:09 PM by joys
Updated 23rd November 2009 at 08:13 PM by joys

I'll start today and let's see how long it'll take me to finish this article, about an easy to build and cheap amplifier, with ECL86 or with a few tweaks an ECL82 can be used. This is actually not my totally own design. It's taken from the 'Muller' Tube Manual, but I added a input stage with tone control 2 or 3-ways, depending on your flavour. And a loudness-control...
What you need accept the passive components are;
(double up all parts for a stereo-amp.)
One EF86 - high-mu signal-pentode, for the tone-ctrl and gain-stage.
One ECL82/86 driver and power pentode for our SE-AMP.
One output transformer, Z = 7k - 10k(if you want to build a stereo, make sure you use the same brand and model, the core and turn-ratio is critical, if you desire the same sound from each channel!)
One power-transformer(mains), 230 - 250V@100ma(or 160 ma for stereo) and 6V3@2-4A(4A for stereo).

I've based my design on this article, from a magazine, printed in '93 Maplins' Valves

this design, presented in the article "A Low Cost Amplifier" is quite OK, and you can use old spare-parts from 'slaughtered' kitchen-radios, and get a decent valve amp! But it is what the title says - A low cost amplifier - and it can be improved on, with a little bit of time, and some 'love'
...more to come....
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    Posted 27th August 2010 at 07:55 PM by dfidler dfidler is offline

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