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ECL82 amplifier help
ECL82 amplifier help
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Old 24th February 2012, 06:07 AM   #1
sunbeam is offline sunbeam  New Zealand
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Default ECL82 amplifier help

HI Folks, I've just aquired an old 60's stereogram and i'm thinking of re-purposing it as a small stand alone amp, just for a bit of fun. The existing layout is an ECC82 as preamp, EZ81 rectifier and an ECL82 per channel as the output stage.
What I would like your learned opinion on is weather it would be better to recreate the existing circuit less RF stage/tone controls etc or would it be best to start afresh reuseing as many of the old bits as possible. Any help wuld be greatly appreciated!
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Old 24th February 2012, 06:48 AM   #2
aardvarkash10 is offline aardvarkash10  New Zealand
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Location: Auckland, NZ
if you are using a CD, Iphad or computer as a source, you won't need the ecc82.

I'd also go ss rectification so you can go large on power supply caps for smoothing.

By then, you are repurposing I guess
"It may not be easy for some to not hear differences, even if they are not there." - Vacuphile,
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Old 25th February 2012, 02:23 PM   #3
radiostar is offline radiostar  Yugoslavia
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I prefer tube rectification, for me it plays better than ss ...
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Old 25th February 2012, 08:00 PM   #4
Eli Duttman is offline Eli Duttman  United States
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Location: Monroe Township, NJ
Originally Posted by radiostar View Post
I prefer tube rectification, for me it plays better than ss ...
True, when crappy 1N4007 diodes are used. If high PIV Schottky diodes are used, no switching noise is generated. Some restraint in sizing the 1st cap. of the PSU filter remains necessary. Neither the power trafo overheating nor the "hash" associated with very short charging pulses (tiny conduction angle) is desirable.
Eli D.

Last edited by Eli Duttman; 25th February 2012 at 08:01 PM. Reason: fixed typo
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