Paul, if the pot is 1 k, set up as a DC divider from a low-Z reference
voltage, and only lightly loaded by an amplifier circuit, you could try
upping it to a 2 k or 5 k, possibly 10 k, and get an immediate
resolution/set-ability boost, with little effect on the rest, and no
other part changes (except for whatever you need to get that nominal
C-field current in the right range - a separate issue).
An easy way to assess the pot capability in-circuit, is to put a high
resolution (5 or 6 digits) DVM on the wiper or amplifier output, and
just pick some values of voltage, and see how closely you can tweak it
to any particular value. You can also observe the discreteness of the
steps, the lash, and maybe some interpolation ripple (non-monotonic
behavior), by very slowly rotating it while watching the DVM values.
This will of course also show if there are any bad spots on the pot, due
to wear, corrosion, dirt, deteriorated grease, etc.
Ed
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