Quote:
Originally Posted by Geist
..I measured Pin 5 to ground its OK.. But, the look of pins 7, 4, 2, and 1 don't look so good, I can't at this point tell IF it is from what I did, or just old gunk on the bottom of the sockets after spraying the tube and socket..
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It's doubtful that visible gunk outside the socket would cause any problem. But a char path inside the socket wouldn't be visible. Pin 5 is immediately adjacent to pin 4 (heater) and this small separation
could provide an arc path, since the heaters are tied to ground.
Even though pin 5 showed no leakage to ground on the ohmeter, i would try "zapping" it briefly with full B+ to see if an arc develops. Use a current limiting resistor (value not critical, 4.7K or thereabouts) and jumper it briefly from pin 5 to the filament (pin 8) of the 5U4. If an arc should develop in the 6AU6 socket, it'll be instantly visible.