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Originally Posted by Chad Hauris
The indicator light is powered by the 6.3 volt filament winding...whether it is in or out of the circuit will not affect performance...however if there was a short at the bulb socket that will take down the filament power and could damage the power transformer. You need to go through the power circuit with a multimeter and confirm where you don't have voltage. Personally I wouldn't mess with a VTVM, I find a good digital multimeter easier to use.
The AVC varies the bias on the RF, converter and IF tubes to vary the gain. There is a delay factor on AVC where a filter capacitor stores voltage to allow for a relatively slow change in gain when the signal strength changes. AVC will not cause rapid variations in volume. The 6AV6 is the detector tube...it rectifies the radio signal, removing the carrier wave and leaving the audio variations. Also the rectified signal is fed to a filter system to provide the AVC voltage which varies w/ signal strength. Also the 6AV6 has a triode portion which is the first audio amp.
The variations in volume are most likely in the audio portion of the set.
Again don't go troubleshooting the problem till you replace those old caps, that way you can rule them out as a problem.
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The set has played strongly and loudly since I got it. Conventional wisdom says that if they weren't broken by now, I have a hunch they aren't the deal even if they need and should face replacement. Which leads to the next reasoning...
Will removing the bulb break the short, or will it break the heater string so that no power will get to them anyway? Another thing to consider is that the bulb was lit all the time UNTIL the failure, which suggests no short was present. This I think brings me back to the vicinity of the 6AV6 again.
You are emphatic about a DVOM, yet reality presents me with a VTVM instead. A digital meter is a great tool, but I am going to have to deal with much the same stuff as any 50-70 yo would have had 20 years ago, for I cannot afford many newfangled gadgets; I live on disability benefits and less than $600. Before this fall I had never spent more than $25 on any radio or speaker. I have relied on the kindness of repair people who took interest in me as I was a "nice guy". I cannot travel 200 mi each way to one anymore; too expensive and he now wants money, and the other one has Hepatitis C and is highly unsure of the length of his remaining life. Put simply, I must learn as I'm running out of repairmen
I think I will send to a member for a 6AV6 after I look at the base of the lamp. Something tells me this one will be easier than the GE. Can this PS really be as fickle as the one in my computer?
Steven