SB401 Power Supply

[Rinkie & Ron Pollack]

I have a SB401/303 that I built about 1971 and have used for 30 years, on
and off.  I think I blew the power transformer out of the 401, and have
another on the way.  Were there different transformers used at different
times?  Mine is part #54-198, as it shows in the manual.  It has 2 primary
windings, with instructions to wire in parallel or series for 110 or 220
volt operation. I got a look at another 401, which has transformer part
#54-143, and only one primary winding.  Are these interchangeable, assuming
110 volt operation?  On the 143, there appears to be 2 black leads as
primary leads, and the secondary leads seem to be the same as the 198.

Does anyone have info on this?  Or, a 401 manual showing the 143
transformer, who might look at the diagram and let me know the connections.

Thanks
Ron K2RP

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