bad precision pot?

[Martin Czech]

:::>I've read somewhere that precision 10 turn wirewound pots have problems.
:::>The slider seems to stick on the windings, that means problems with
:::>resolution.  And it was said that mechanical shock or vibration would
:::>change the value.  The author claimed that he would rather prefer ordinary
:::>pots, maybe two, one for coarse and one for fine.
:::
:::Maybe they were referring to a type where the actual wiper only make one turn but there is gears to make the knob turn 10 times? Something like the multiturn trimpots, which have the problems you describe.
:::

So far I've never encountered any problems with cermet 10 turn trimmers.
But it is true that they are not made for many thousands of revolutions,
the cermet film is said to suffer. They are made for ocasional trimming.

m.c.