I scored a sweet midcentury Magnavox console here in Spain that had been imported in the early 1960s. It has the same Collaro-made Micromatic changer that all the Magnavoxes had back then. I've got the tuner, multiplex decoder, and power amp all repaired and recapped, and sounding great, and have started on the changer.
After cleaning and lubing, and adjusting the setdown screw, it's working smoothly. There is, however, one serious problem: the changer was sold in the United States and the motor was designed for 60Hz mains power, so here in Europe it runs around 20% slow.
Googling around turns up a few suggestions about using one of those cheap "pure sine wave" inverters to power it, but those aren't really a sine wave and cause horrible noise and overheating in the motor.
So I'm thinking about a possible solution, and wonder if I can get some of the more knowledgeable folks here to give me a reality check or alternative. My idea is to combine a
cheap chinese frequency generator board with a
cheap chinese PWM audio amplifier board to drive a 12V:120V power transformer connected in reverse.
If I'm calculating right, 20W into 8 ohms should give me the 12V I need of a 60Hz sine wave, to then be stepped up by the transformer and yield 120V. I'll still have to build a power supply for the two boards.
What am I missing? Or is there a simpler way? I get that I could build a 60Hz oscillator out of a few parts but frankly for 3 bucks I'm inclined to go with the digital one.