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Hi

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Lecson Group

I do however recall that 2 of the pins from the "input" socket (which is an unusual 240 deg 7 pin socket) to the AP1 and AP3 power amps are actually "return" signals, from the power amp, (using pins 6 and 7) back to the AC1 pre-amp, that provide an attenuated signal to the AC1 headphone socket.

Lecson Ap1 & Ac1 Power/Pre-Amplifiers

Regards