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Active device in the remote is a 2N408 PNP transistor, and a sonic transducer. I am not sure howe the reverse function works but for reverse there is +6.5 volts on the emitter of the oscillator transistor q2001. What really looks like a nightmare is that only one motor with a series of slip clutches is used in the reciever to control the functions. The functions are plate driven relays from the 12az7 tubes. There is also a motor reverse relay. I'm glad I didn't have to service one.
Bill R.
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