[Guest]

Hi.

thanks for the reply.
yes I also thought so, especially in view of teh output being Class B Push-Pull.

However I called The Speaker Shop, and the guy there who knows Philco 20 speakers well, told me that it is correct that one of the 4 wires is unconnected, and it is there just in case for other versions, and the XFMR is without cenertap.
I am not sure how the Pushpull can handle a XFMR without centertap - it is a standard way of doing this; no centertap usually mean Class A amplifier would be used, not a pushpull.

I am confused. I don't think I'd have a wrong speaker arrangement in there, and I clearly see the chassis being Philco 20.