Re: Quad 44 Preamplifier volume
If an input were connected to either the 5 V or 1.6 V (phono) output sockets, as might be the case here, then it is likely that an attenuated version of that input would appear at the 500 mV (4-pin DIN) output. The attenuation would be greater via the 5 V input than via the 1.6 V input. Clearly connecting an input this way would bypass all internal circuitry.
Cheers,
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