10-09-2023, 04:55 PM
Well I have been listening to tube sets a long time, occasionally have had sound fade on a set as a tube fades. Today I am off work and was listening to a local and I heard a pop and then nothing on my RCA.
So being lazy I turned it around and felt the tube for heat, 12SA7 cooler than rest but pilot light was on and had a hum in set.
I had a spare 12SA7 and yes that was the culprit, have you just had a tube go poof? I was of the impression that they may go weak and then just the set fades, should I be concerned my radio has a voltage problem or just resign myself to the fact that a 70 year old tube cant just cut it any longer? Amazing they last so long I guess. Who knows how long the one that popped was in service, from the graphics on tube I would say it was from late forties.
Paul
So being lazy I turned it around and felt the tube for heat, 12SA7 cooler than rest but pilot light was on and had a hum in set.
I had a spare 12SA7 and yes that was the culprit, have you just had a tube go poof? I was of the impression that they may go weak and then just the set fades, should I be concerned my radio has a voltage problem or just resign myself to the fact that a 70 year old tube cant just cut it any longer? Amazing they last so long I guess. Who knows how long the one that popped was in service, from the graphics on tube I would say it was from late forties.
Paul
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