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Well if the cap for the 6BK4 was laying against the high voltage cage could that have caused a spark? There was no audible evidence of one.
I replaced a few suspect caps around the 3/4 amp fuse (BTW Radio Shack is the only place that stocks these anymore) and powered the set back up with the 3A3 and 6BK4 back in circuit, 6DQ5 and 6AU4 removed. One strange pop but no blown fuse up to 120V. I also got a strange knocking sound from around the high voltage cage - not the sound of a spark but more like the sound of an oscillator at around 5 Hz.
I put the set together and powered everything up on the variac. I reached 110V where I began to hear untuned station static from the speakers, and the high voltage scanning noise came up shortly thereafter. Within 10 seconds of that happening I began to hear a rush of static around the set so I powered it down. It sounded just like a sweater fresh out of the dryer if you know what I mean. Not thinking this is normal I powered the set back down but so far I can't find any problems. The flyback looks like new compared to some sets I've seen - so i don't think that is the culprit. Also, I never saw any static or picture.
Any ideas?
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