MagneQuest/Peerless Forum

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RE: SET Headphone amp

Posted by OldNuke on August 24, 2016 at 10:32:25:
Well, I think I fixed the issue but I didn't solve the issue. I added a -8db pad onto the TRS jack (38K in series, 49K to ground) that cured all the hum problems. Completely black background on my Oppo PM3's, no hum anywhere.

The pad is a little too much, my first 5 clicks on the volume pot are useless and the max volume is just below the "rocking out" level I want so I'm going to try a -1 or -3db when the grid chokes I ordered come in. I know this is another source of possible hum but I never thought this would be easy :)

Going to try something I saw on the Bottlehead big headphone amp and route the inputs thru grounded copper pipes and relocate my setting switches as far away from the power transformer and the 404's as possible, shouldn't hurt and will make the amp pictures more interesting.