Re: Grundig TK14
I've looked at the TK14 service manual, and from the circuit diagram there is nothing that the user needs to do to enable the high-impedance output. There is a switch contact that turns it off in record mode which I guess could be faulty, but as the machine works otherwise, I think that's unlikely.
How exactly is your cable wired? Can you provide photos of the wiring in the DIN plug and in the jack plug, please.
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