[Amps] Filament transformer for SB-220 needed

[Paul Kraemer]

Does that affect the bias?
Paul K0UYA
----- Original Message ----- 
From: "Commander John" <crazytvjohn at yahoo.com>
To: <amps at contesting.com>
Sent: Tuesday, March 01, 2011 9:32 AM
Subject: Re: [Amps] Filament transformer for SB-220 needed


>I remember in older handbooks a way to use a filament transformer without a 
>center tap by connecting 2 resistors between the filament leads and hooking 
>the return to the place where the two resistors connected together.  Worth 
>checking into.
> john W9ZY
>
>
> --- On Sun, 2/27/11, Jim Mullen <kk1w.jim at gmail.com> wrote:
>
>> 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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