[Tubesforme]

Take a look here:  http://www.philcoradio.com/phorum/showth...?tid=14991   Scroll down a ways and you will see speaker wiring diagrams, the upper one would be right for your 70. Since the 70 speaker does not have a hum bucking coil, the polarity of the field coil doesn't matter.

Steve

Thank you Steve. that is exactly what I was looking for. I had been told just to use the transformer that was on the 20 speaker and use only 1/2 of the primary and it would work. That I doubted. The impedance would be way off. I was able to get the correct transformer, but wasn't sure about the proper wiring. Once again I am indebted to you. Thank you.

Michael (Tubesforme)