Hello, Well after finishing some mods on my R-4C, I seem to have a case of the wandering S-meter. I had to replace R-36 due to a close encounter with my soldering iron, but now seem to be having a difficult time getting the circuit to settle down. Seems the longer the radio is on, the meter will gradually increase to about S-3 and stay there before drifting back down. No matter how many times I attempt the adjustment, the meter never remains at S-1 for very long. One time it would drift downward, but think that might have been more of an issue with the noise blanker gain adjustments.
Another issue is when the R-4C is in external mute, I get a low volume feedback when the T-4XC is keyed. This did not happen prior to the work being performed on the receiver. I have measured all the applicable voltages on all the tubes and they were well within specs per the manual. Just curious if anyone has any pointers on the drifting meter. Guess I could check the factory R33/34 resister, but according to the manual, that value was selected during testing. So short of replacing the meter zero and bias pot. I suppose further testing may be in order. Thanks for any assistance. Robb N0RU
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