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Hard to tell from the underchassis picture, but it looks like the motor is controlled by a separate switch, and the amp off the back of the volume control? I could see why: stop the turntable between records without turning off the amp (and then forget the amp is on and leave it on for days.) I first thought this was a set that put a lower voltage motor in series with the tube heaters, but think this was too early. There must be a wirewound dropper in there for the heaters.
I second the motion to isolate the hot chassis with a cap and high value resistor. Lots of AA5 radios are done that way.
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Reece
Perfection is hard to reach with a screwdriver.
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