01-27-2026, 11:05 AM
Hi morph, by line voltage I meant B+ the input is 117v AC and the B+ was measuring 122v down from 130v after replacing a missing wire that I took out due to crumbling. That put a 10k back into the 1st AF/ Det circuit diode plate. Now it’s wired as it was before I tried to put the lamp in at pin 8 of 7C6 which burned the filament. I then put in a 7B6 for a quick check. Checking now B+ is 122vdc on one side of the field, the output side and 95vdc on the rect cathode side. Should be 108 and 83 vdc
The 7B6 is very temporary and reads 81vdc at the plate which should be 28vdc with the 7C6 which I have ordered and won’t receive for a few days. I have studied electronics with a BS in Engineering Physics/ Electronics. Radio tube theory is still a new study to me so I’m stumbling through since I’ve been away from electronics theory and application for almost 20 years. It’s coming back but appreciate all the help I can get.
The 7B6 is very temporary and reads 81vdc at the plate which should be 28vdc with the 7C6 which I have ordered and won’t receive for a few days. I have studied electronics with a BS in Engineering Physics/ Electronics. Radio tube theory is still a new study to me so I’m stumbling through since I’ve been away from electronics theory and application for almost 20 years. It’s coming back but appreciate all the help I can get.




