[Amps] shorted 3-500

[Gary Smith]

Paul,

Much as Herb did, in the 80's I "fixed an 
8877 with the same issue by connecting the 
pins to a charged many farad capacitor 
from an old computer power supply. I had a 
volt meter attached, banged the 8877 & 
finally saw the voltage at zero. It had 
welded the broken parts together. From 
that point on the dead 8877 worked 100% 
and the tube lasted many years after that.

73,

Gary
KA1J

> Paul if you see a visual sag on any part of the grid you might try
> laying the tube on a towel on a table and giving it some good wacks
> will a rubber mallet. Or as an alternative,  I fixed one a few years
> back with a car battery and a jumper cable by giving the cathode to
> grid tube pins a few jolts.  This may work or it may weld the two
> together.  This may be also worth a try.
> 
> Herb, KV4FZ
> 
> On Sat, Oct 12, 2019 at 1:23 PM Paul Kraemer <elespe at lisco.com> wrote:
> 
> > Does anyone have a restoration technique to remove a grid cathode
> > short on a 3-500Z?
> >
> > I have on just laying here---don't know why I keep it.  Filament
> > still lights.  No plate to anything short.  Free for postage from
> > 52556
> >
> > Paul K0UYA
> >
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