On Sun, 12 May 2019 12:49:21 -0500, Fox's Mercantile wrote:

There is NO adjusting the bias. It's NOT adjustable.
The difference in readings is based on the difference in output for each
range. It's entirely likely it was like that new from the factory.

Whist it's true there are no trim pots involved, the fixed resistor
values will have changed over the last 65 years, which is quite possibly
responsible for the fault. They would need to be hooked out individually
and replaced, but it's not worth it.




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