[Joeztech]

It turned out that the popping sound I heard was the second electrolytic capacitor in the B+ string which I had already replaced. This one follows the field core of the speaker. It is intermittently shorting during warm-up, so I will be ordering another one. This time I will get one that significantly exceeds the voltage rating of the original unit. The 80 rectifier puts out voltage before the rest of the tubes begin to conduct. It would be even worse if the power supply had solid state rectifiers instead of a tube rectifier. It is time to send a new order to Mouser Electronics. I will not be turning the radio on again until I have this problem solved.

Joe