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@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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