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46-1201 model 128 restore and question
Mondial
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#14

11-17-2013, 08:42 PM
I agree with Jerry. Something is not right with the 7C6 wiring. Pin 7 should have 0 voltage, as it should be connected to the common B- just like the 7B7 pin 5 you are measuring from. Did you disconnect any wiring and not reconnect it?

Pin 7 of the 7C6 is the cathode, and if it is left floating the tube will not conduct current, making the plate voltage high. The tube will not amplify in this condition which is probably why you have the low distorted audio.
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46-1201 model 128 restore and question - by tig1 - 11-07-2013, 07:47 PM
RE: 46-1201 model 128 restore and question - by Mondial - 11-17-2013, 08:42 PM



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