[AMPS] I did a dumb thing!

[Mike]

Would there be any long term detrimental effect of running
very high filament voltage on 3-500Z for a few seconds. I was
testing a Drake L-7 here and forgot to jumper the filament
transformer for 240V (jumpers were set for 110V). I realized
my mistake after having the amp on for about 2 seconds and
shut every down (the bright panel lights and fast running fan
gave it away). After I set the jumper properly and fired the
amp up again, everything seemed to play okay - full output on
all bands. Not sure what the 3-500Z's actually saw during that
short period as I suppose it depends on the winding resistance
of the filament transformer. Worst case would have been
around 10V. Hopefully the filaments didn't really have time
to overheat signifcantly, but I don't really have any experience
with this sort of thing.

This all reminds me of the time I dropped a good 3-500Z
on a concrete floor. I should have watched TV with my wife
tonight.

73 de Mike, W4EF...........................................................




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