09-20-2019, 05:45 PM
I'm still troubleshooting garbled audio on my 38-116 that I've recapped and replaced out-of-tolerance resistors. I've been checking tube voltages and find that they are significantly low. The lowest measurement was on the 6J5G driver tube. I measured 48 vdc on it's plate instead of the specified 260 vdc. I tried another 6J5 tube and got the same result. I started checking heater circuit pins 2 and 7 on various tubes. I found 6.3 vac on pin 7 but 0 on pin 2. I checked the volts out of the transformer on the two black wires for the heater circuit and found that the output of the transformer for pin 2 was 0. I assume the problem is in the power transformer. But, I wonder why the wiring from the transformer for 6L6G pin 7 would first go to a chassis ground terminal on the bakelite block. Shouldn't it just go direct to pin 7? Note: Dial lamps work normally.
Thanks,
Larry
Thanks,
Larry