So far for my experiments I had been running the cryocooler from a 300 W audio amp, with the Linux 'sgen' program on the PC to generate 60 Hz. I needed that amp for my sound system, so decided to try the original PWM amp. Had to fool some temp sensors, by making a fake thermocouple voltage with a pot and voltage source.
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Had to stop, not sufficient cooling this way of the cryocooler.
Bottle of liquid air.... ?
Results are good.
I have also been doing some measurements on YCbO All a bit chaotic, nothing has a fixed place yet in the new lab.