Divining intermittant cathode-heater leakage?
N_Cook
My tester goes only to 25Megohm , consistent leakage usually shows itself in
that range , would going higher by some modification elicit intermittants?
Any other tips? heating the envelope with hot air gun? holding valve
horizontally while testing ? testing at higher plate/anode voltage ?
whit3rd
> Any tips for doing so?
For intermittent tests, you'd like to tap the tube (use a wooden
stick). My preference would be to test with cathode
warm, using a neon lamp and limit resistor to a plate
supply (200V or so), returned to the heater.
An intermittent will make the lamp flash, but it isn't
clear what, if any, motion you'd see on a meter needle.
Leakage (like a gassy tube) might cause some flicker, too.
N_Cook
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reply
you wouldn't happen to know what effective leakage resistance in say ECC83
starts to make its presence felt audibly on the output of an amp? I find
neons rather temperamental and not reliable in DC situations. There is a
mains neon on my bench ps that rarely lights unless the room light is very
dim or off , very odd. If the ps packs up then I will sort that and the neon
while in there
mike
intermittent or otherwise, with a stun gun.
At >25M, you're gonna need to look for issues with the socket and the
circuitry hooked to it. Doesn't take a very big spider web or chunk
of damp dust to make
25M.
I once had a spider build a tidy web across a CDROM read lens...but
that's another story.
YMMV
JeffM
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>
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