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Help identifying vintage tube amp connector

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I recently came into a cabinet turntable/radio tube amp, and it has a 5 pin connector on the back. The only indication of what it might be is a "tape recorder" button on the main panel. There is (what I assume is German) writing beside it, but I can't read it.

The manufacturer is NordMende, and the model is 3/683 Stereo.

I have found a schematic of the tube amp (attached). From what I can make of it, the connector is either the one labeled "HALL" or, more likely, either "TA" or "TB". My reasoning being that there are two external sources, hence two T labels.

What do you think this connector is for? "Tape recorder" implies it's an output, but being similar to the one connecting to the turntable, it could be another input. If it is an input, could it accept line level inputs?

Thanks,
Hengy

[image]Image:connector|none[/image]
 

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