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Akai motor run capacitor
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floobydust:
For tension, it looks like the reel motors are run in series with reduced voltage 100VAC & R2. The lower torque reel gets reverse and less current by resistor R4 shunting that motor.
So there needs to be somewhat of a balance between the reel motor circuits (run caps) for it to work.

The servo controls capstan motor speed by varying the AC voltage to the motor, not as a synchronous motor like in turntables.
bdunham7:

--- Quote from: floobydust on July 06, 2021, 03:07:00 am ---The servo controls capstan motor speed by varying the AC voltage to the motor, not as a synchronous motor like in turntables.

--- End quote ---

OK, I see it now.  I haven't run into that setup before.  I'm guessing that at 60Hz, 3uF vs 3.5 still isn't going to matter too much.  And the capstan flywheel must be huge...
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