[R-390] Microphonic Parts?

[Barry]

One of the characteristics of this resistor is "non-magnetic".  It's located near a vibrator/chopper so that may be why they chose it.  Are modern carbon film resistors affected significantly by magnetics?

Barry - N4BUQ

 On Sat 14/04/12  3:15 PM , Barry n4buq at knology.net sent:
> > Looking at the resistor, it appears to be a rather
> special looking unit,> unlike the other carbon comps used in the other
> circuitry.  There are other> 10M units that are plain old carbon comp.  Not sure
> why they would want> such a different style resistor there.  I don't
> have a parts list for this> model so I can't verify anything specific about it.
>  It does measure very> close to 10M, though.
> 
> Looking closer, this is a Welwyn Panclimatic C22 10M resistor.  Apparently
> these were very high-quality units for their time.  Not sure why it would
> be more inclined to make noise, though.
> Any experiences with these?
> 
> Barry - N4BUQ
> 
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