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Re: [Amps] 3-500Z viable after long storage?

Subject: Re: [Amps] 3-500Z viable after long storage?
From: Alek Petkovic <>
Date: Mon, 10 Aug 2009 14:46:55 +0800
List-post: <">>
G'day Jim,

 From what I understand about 3-500Z tubes and the like, the only way 
to getter them is to get them working with colour. Just running the 
filaments will achieve nothing.
Therefore I say, just go for it. Get'em running as they are meant to 
run. As long as you have glitch protection, you shouldn't damage too much.

Of greater concern than the tubes would surely be the powersupply. 
That's the thing I would be switching on, plugging into the wall 
socket, donning earmuffs and eye protection and switching on with a 
broomstick. Ha ha.

The alternative is for you to ship it straight to Perth, Western 
Australia and let me take the risk/s.

73 and good luck,
Alek. VK6APK

At 02:36 PM 10/08/2009, Jim Barber wrote:
>Or, how about putting 50M in series with each anode cap and then
>monitoring the anodes for voltage drops? (arcs) I don't know if limiting
>the current that severely would allow arcs that might occur to eat any
>gas molecules anyway, but I thought I'd throw it out there.
>Jim, N7CXI
>Jim Barber wrote:
> > The Henry 3K-A I just picked up (loooonnnggg drive!) has a set of what
> > were 12 years ago "fresh" 3-500Z's with it. The amp and tubes have been
> > sitting in the OM's nice, warm, dry shack for 12 years with no power
> > applied. He never got around to pulling 240V into the new shack after he
> > moved.
> >
> > The question is should I try them? There's no high-pot tester available
> > locally that I know of. My fear, of course is that one or both might be
> > gassy and flash over, potentially damaging the HV supply.
> >
> > Thanks,
> > Jim, N7CXI
> >
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