[Amps] SB-220 help

[Carl]

Early 220's had a problem with shorting the filament/bias transformer if it 
was wired for 115V and the zener shorted. There is a change notice on the 
web.

Carl
KM1H


----- Original Message ----- 
From: "mike stokes" <mike9v at gmail.com>
To: "Amps" <amps at contesting.com>
Sent: Tuesday, April 23, 2013 6:28 PM
Subject: [Amps] SB-220 help


>I just picked up a used non working SB-220.  Suppoesdly the filament
> transformer smoked.  Still have to pull it apart and see what is going
> on inside.  Tubes are supposedly still good.
>
> The question I have is it possible/likely that a tube failure caused
> the filament transformer to smoke ?  What is the best way to check the
> tubes to insure they don't cause more problems ?
>
> Thanks in advance.
>
> -- 
> Mike Stokes
> KK9V
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