UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - EL34 power amp reworked as a stereo amplifier

Electronpusher0 · 5th Jan 2019, 9:22 am

Very Nice!
re the hum have you tried connecting the heaters across a low value pot say 200 ohm with the wiper to 0v (obviously there should be no other connection from the heater circuit to 0v) Varying the wiper either side of centre position should affect the hum allowing you to minimise it.

Peter

5th Jan 2019, 9:22 am	#6
Electronpusher0 Nonode Join Date: Jun 2016 Location: Bognor Regis, West Sussex, UK. Posts: 2,294	Re: EL34 power amp reworked as a stereo amplifier Very Nice! re the hum have you tried connecting the heaters across a low value pot say 200 ohm with the wiper to 0v (obviously there should be no other connection from the heater circuit to 0v) Varying the wiper either side of centre position should affect the hum allowing you to minimise it. Peter