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Ralph Mowery

In article ,
says...

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.

Most likely the difference in the Q of the circuits and maybe the gain
of the tube at different frequencies. That would change the power of
the osicllator and voltages. One thing I would look at would be all the
reisitors in the generator. Those old carbon ones often change value
after a number of years, most seem to go up in value.