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I find that I have 3 variations of the AC Induction Disc motor used in Orthophonic Credenzas and other Victrolas: One is marked "25-40 Cycles per second" and is in an 8-30X I bought from a part of Buffalo which had 25Hz power until some time in the 1940s, another is "60 Cycles per seond" which came from Ebay (I wanted to have a spare, in case the first one croaked) and the latest acquisition is "25-60 Cycles per second", in a 1926 Credenza X.

They all look identical to me, but there must be some differences, yes?

The differences are in the coils.

From 1931 Service Bulletin Supplement:

105 to 120 Volts

Part # 16355 is 40 to 60 cycles
Part # 17576 is 25 to 30 cycles
Part # 17860 is 40 to 60 cycles - For Automatic Machines

For 40 cycle operation there was a tapped 31 ohm resistor

There were also transformers available for operation on 220 or 200 or 150 volts 60 cycles


Chuck