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[Amps] al80a

To: <>
Subject: [Amps] al80a
From: (Steve Thompson)
Date: Fri, 2 Aug 2002 06:47:42 +0100
-----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 of
>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
>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 30
>ohms between the two terminals
A genuine question on my part, not meant to appear critical of Carl in any

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 powered
up regardless?


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