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[Amps] al80a

To: <>
Subject: [Amps] al80a
From: (carl seyersdahl)
Date: Fri, 2 Aug 2002 08:20:24 -0400
>From Steve's comment , I went back and ran the same test on the tube in the
upright, vertical, as it would be in the amp,    position.!!  the result was
the same. 20-25 ohms as soon as the filament warmed up. !!
  carl / kz5ca
----- Original Message -----
From: "Steve Thompson" <>
To: "'Amps'" <>
Sent: Friday, August 02, 2002 1:47 AM
Subject: Re: [Amps] al80a

> -----Original Message-----
> From: carl seyersdahl <>
> To: 'Amps' <>
To: <>
> Date: 01 August 2002 23:46
> Subject: [Amps] al80a
> > In my FWIW dept. I looked over the entire amp and didn't find anything
> >conncern. I did find a burned resistor which turned out to be in the
> >external 12vdc line. , but no burned bandswitch contacts, no evidence of
> >anything unusual, but still I knew something was wrong.
> > I tried something interesting , tho, I took the tube out and laid it on
> the
> >bench and hooked up the filament with jumpers , connected the ohmeter
> >between the fil and the grid and when I fired it up, there it was, about
> >ohms between the two terminals
> A genuine question on my part, not meant to appear critical of Carl in any
> way.
> You described the tube as 'laid' on the bench - if this is on its side
> rather than standing up, will the filament sag and short when it is
> up regardless?
> Steve
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