[Hallicrafters] Help with SX-99 xfmr replacement

[Rbethman]

Roger,

The replacement came directly from a "donor" SX-99.

I see the same color leads in the one I'm trying to get back on the air.

Rodger wrote:
> Hi Bob,
>
> Are the leads you are referring to on the replacement transformer?  It
> sounds like this is the case and it is not an "exact" replacement for the
> original-however it may be usable with some changes.
>
> Do the black leads have any additional color woven into them?  Using an
> ohmmeter, see if there is continuity between them or between pairs of them.
> Typically, black is used to indicate the primary leads and given your
> description it sounds like the transformer probably is a dual primary for
> either 120 or 240 volt service but you will need to ascertain this before
> using it.
>
> The 4 green leads should be two sets of filament windings and given the
> color coding it is likely that they are both 6.3 volt windings.  The two
> yellowish/tan leads should be the high voltage secondary but unless there is
> a center tap (and it doesn't sound like there is) then you won't be able to
> use this transformer with the existing rectifier setup.  Unless there is
> continuity between the yellowish/tan leads and one of the other leads then
> this transformer was designed for use with a solid state bridge recfifier.
>
> If what I have guessed at so far is fairly accurate then you need to decide
> whether you want to keep the SX-99 stock or if you are going to try to make
> the transformer you have work in it.  You might look at the Hammond
> transformer line (available from Antique Electronic Supply and others) to
> see if they have a closer match to the Hallicrafters original.
>
> 73, Rodger WQ9E
>
>
>
>   

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