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Old 9th Nov 2019, 5:17 pm   #57
Join Date: Nov 2016
Location: Budapest, Hungary
Posts: 348
Default Re: Vintage Radio and Phonograph cutter schematic

Originally Posted by ms660 View Post
For instability and hum I would check the HT filter capacitor (electrolytic)

If no joy then short the control grids of V5 to chassis, that's pin 3 and 4 of the 6SC7 to chassis and note any difference.

I did tie the pin 3 and 4 together to chassis. Unfortunately no sound is coming through the speaker or no sound on the external speaker plug either.

Hum is reduced and no any other issues but the sound has gone...
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