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I just acquired an AR LS-3 (solid state) preamp. I have several concerns about it; but first in line is to understand the functioning of the channel balance mechanism. (I/m getting some confusing results balancing results.)

The parts list states that the component is a 100K Dual Balance Pot, part # 45100529. I can’t find that number, but there is a Bournes pot that could be the one.

https://www.mouser.com/datasheet/2/54/PDB18-1013655.pdf

I’d like to be able to understand how the pot changes the balance, and by how much. Questions like: are the changes linear (or seem linear to the ear)? Does one channel increase at the same level as the other decreases? How could I could I calculate the decibel increase/decrease at a given output?

Thanks