All,
Thanks to everyone who made suggestions. Solder on the pins all look
ok. .5Ω's on each filament. I'm guessing a grid to filament short/
leak when it gets hot. I did notice a slight bit of clouding near
the top of the envelope that wasn't there before. Maybe from running
the filament with way less than 5V. Thoughts ? At any rate, a
replacement 3-400Z is gonna be hard to find (out of production for
years) so I'll probably just get a new 3-500 to go with the one I
already have.
Rick
W9WS
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