MagneQuest/Peerless Forum

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RE: SET Headphone amp

Posted by OldNuke on August 8, 2016 at 01:39:34:
Latest steps: increased last power supply capacitor to 82uF (all I had in the junk box). Changed out the pot and padded the input. Moved TL404, headphone jack and RCA grounds to the same point. Moved speaker connection ground to PS safety ground. Bypassed last PS cap with a 1.0 uF Obligatto gold. Moved BCP-15's around to get the lowest hum heard over headphones. Still at around 10 mV AC on the speaker outputs.
Listening to Gary Clark Jr's album, sounds sweet but the same problems. Hum in the quiet points and just below the music and buzz that can be nulled at 30 -50% of volume pot and increases as pot increases.
I'll tube roll the 12at7 and 45's to get a quiet set while I wait for a BCP-15+ from Mike L, will re route the input wiring away from everything.