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HD130... What is this mod?

I bought this amp many years ago and never knew what this mod is for. There is an extra pot and 1/4" jack tied into the out put jacks and impedance selector.
Does anyone know what this would be used for?

bill_moore's picture

Headphone out?

Or maybe adjustable line out?


Thank you Bill.

I thought about a line out, but was always a little cautious about connecting anything to the 1/4" jack since it ties into the Output jacks and impedance selector... and of course that it is an obvious Mod that is not labeled haha..

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