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100Hz Hum in Valve Amp
100Hz Hum in Valve Amp
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Old 7th December 2017, 06:28 PM   #11
azazello is offline azazello  Bulgaria
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Join Date: Aug 2008
Location: Bulgaria
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/.
Projects: SE GK71, SE 12BQ6, PP KT88, OTL-OCL 6AS7 Gen. Electric, SEs 2A3 RCA, 300B JJ, 6S4S, 4P1L, EL11 Telefunken, 6AS7 RCA, 6S33S, 6S41S, 6S19P, E84L Siemens, E236L Telefunken, headphone ampl. OTL Loftin White 6AS7 RCA,...
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Old 7th December 2017, 06:37 PM   #12
Bassy is offline Bassy  United Kingdom
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Join Date: Mar 2016
Location: Newcastle
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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