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Hi I substituded video amp V5 (6AU6) tube with a known good tube and I also tried a known good 6AL5 ratio detector tube and there still was a buzz. I checked the voltage across 6800 ohm resistor (R138) and it reads 93V. I haven't checked the resistors around the ratio detector circuit yet. I did check the B+ and the B++ voltages and the voltages were B+ a little low at 100.7V and B++ a little high at 256.4V. I don't know if this is ok or not. Thanks for all your help, I'm learning as I go along, as this is my first restoration for either a radio or tv. Thanks again!
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