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Re: [Amps] Filament transformer for SB-220 needed

To: "'Jim Mullen'" <>, <>
Subject: Re: [Amps] Filament transformer for SB-220 needed
From: "Gary Schafer" <>
Date: Mon, 28 Feb 2011 11:24:16 -0500
List-post: <">>
If you don't want to buy a new filament transformer you can use a small 6
volt or 12 volt filament transformer in parallel with the one in the SB220.
Use the center tap on the small transformer just as you would from the
original transformer. Only do not connect any leads on the primary side of
the new transformer to anything. Be sure to insulate those primary leads as
they will have 50 to 100 volts on them.

Gary  K4FMX

> -----Original Message-----
> From: []
> On Behalf Of Jim Mullen
> Sent: Sunday, February 27, 2011 5:28 PM
> To:
> Subject: [Amps] Filament transformer for SB-220 needed
> The subject pretty much says it all. My SB-220's filament transformer
> decided to quit during the ARRL DXCW contest last week. An odd failure,
> the
> center tap of the 5V winding is no longer 'tapped'. I pulled the
> transformer
> hoping the connection would be visible after taking off the end bell but
> no
> joy.
> The transformer is in fine shape except for non-tapped CT. Windings look
> good, no signs of overheating, both primaries and the other secondary
> are
> good too.
> I know Harbach has new ones but if I could scrape up a used one for less
> $$
> that would be great.
> '73...
> Jim/KK1W
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