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Re: [Amps] AL-1200 Intermittent HV Short

To: "Bill, W6WRT Turner" <wrt@dslextreme.com>
Subject: Re: [Amps] AL-1200 Intermittent HV Short
From: R.Measures <r@somis.org>
Date: Mon, 8 Mar 2004 11:03:16 -0800
List-post: <mailto:amps@contesting.com>
>On Mon, 8 Mar 2004 08:28:38 -0800, R. Measures wrote:
>
>>?  tnx.  Gassy tubes usually don't blow the fuse, they draw anode-I on
>>standby.
>
>_________________________________________________________
>
>Ok, if you say so.  My only experience with a known gassy tube was a
>3-500Z in a Heathkit SB-1000.  I powered up the amp after it had been
>sitting for about five years.  The fuse blew instantly.  I connected it
>to a variac and slowly raised the line voltage.  The tube started
>glowing a nice purple inside and was obviously gassy.
>
?  agreed.  It would have made an interesting lamp base if powered by a
neon sign xfmr.

>My AL-1200, on the other hand, developed it's problem relatively
>overnight, so gas may not be a likely culprit.  I mentioned it only
>because of the possibility.  More likely, something internal shorted.

?  I know of another case where a 1200A7  filament shorted to the grid,
however, 0v from grid to filament  would not cause a fuse to blow.
>
cheers, Bill
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