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Old 24th December 2012, 09:42 AM   #11
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Originally Posted by mmmalmberg View Post
Got it. Thank you all! Basic diagnostics I guess, I should have thought of it, if you have one good channel, start comparing and see what's different. Per Chip647, I checked the resistance on each of the inputs. ~150K on the good side and open on the other. That made it easy for me to go over the board with a loupe and I found a sneaky little missed connection. Soldered that up and bingo, silence. Yay! Thanks again.
That is why I mentioned re-soldering the connections.
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Old 24th December 2012, 03:57 PM   #12
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Originally Posted by Original Burnedfingers View Post
That is why I mentioned re-soldering the connections.
Yep, makes sense - thanks!
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Old 24th December 2012, 05:28 PM   #13
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Originally Posted by Tesla88 View Post
If you swapped the Output Trasformer primary connections for mistake , the NFB work like a positive feedback , in most case you get a self oscillating amplifier that produces a squealing sound so is easy to spot because amp wont work at all
That's great information; when I was recently putting new (Audioregenesis) boards in my son's Dynaco SCA35 I was wondering what would happen if I got those wrong. Thankfully I got it right but now I know the alternative Thanks again...

And Happy Holidays to all
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