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Jon Elson[_3_]

wrote:

The problem is that these potentiometers (47Kohm) have an extra fourth
contact which is at fixed position at 10K from one end. It's the first
time I see such a potentiometer with fixed divider. Does anyone know how
to source a suitable replacement?
This is called a "loudness compensaton" pot, and it is usually connected to
an RC network to adjust the treble/bass balance as the volume is changed,
to compensate for some subtle effects in the human ear. All good
Hi-Fi gear used to have this type of pot.

Jon