In the tube or tubes you can send me your no. i will call you, bill
> From: km1h@jeremy.mv.com
> To: carlclawson@verizon.net; amps@contesting.com
> Date: Sat, 13 Mar 2010 20:53:35 -0500
> Subject: Re: [Amps] LK500ZB (2 x 3-500Z), most likely cause of zap/arc?
>
> Where is this visible arcing taking place?
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "Carl Clawson" <carlclawson@verizon.net>
> To: <amps@contesting.com>
> Sent: Saturday, March 13, 2010 8:35 PM
> Subject: [Amps] LK500ZB (2 x 3-500Z), most likely cause of zap/arc?
>
>
> > Anyone have an idea of a favorite failure mode that would cause visible
> > and
> > audible arcing in the tube compartment? I'm trying to repair one. Put 10
> > or
> > 20 watts drive to it with the tune controls at nominal settings, you get
> > maybe 400 mA plate current. Then as soon as you start rotating the tune
> > control...Zap! Followed by blown fuse. And blown grid meter shunt
> > resistor.
> >
> > There's no visible damage, except the varnish is peeling in a few places
> > on
> > the plate choke. It doesn't look burnt or anything, but does that indicate
> > a
> > choke problem? Or just old age?
> >
> >>From what I've read on this reflector before, bad parasitic suppressors
> > would be my first guess. But the benefit of your experience will be
> > appreciated. I don't have a garage full of spare tubes, chokes, and other
> > parts that I can swap in so I'd like to go with the best odds before I
> > start
> > buying stuff to try.
> >
> > 73 and thanks,
> > Carl WS7L
> >
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