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100Hz Hum in Valve Amp
100Hz Hum in Valve Amp
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Old 7th December 2017, 07:28 PM   #11
azazello is offline azazello  Bulgaria
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Quote:
Originally Posted by Merlinb View Post
That is possibly the most expensive and least logical first step.
100 Hz comes from worst filtering of +U and adding chock for 30 Eu will decide most of hmmm problems, or try starting iron chock for luminiscent tubes with R 30 - 40 ohm. /Input tracks and grounding cause 50 Hz hmmm/.
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Old 7th December 2017, 07:37 PM   #12
Bassy is offline Bassy  United Kingdom
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Thanks for all the replies and apologies for the lack of schematic, it's on my old pc but I'll post it tomorrow some time. The inductive or capacitive coupling sounds possible, some but not all of the signal wires are shielded and there could be a gap somewhere. I have checked and rechecked grounding but I'll check again in case I've missed something.
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