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RE: GM20 questions

Posted by cpotl (A) on June 9, 2010 at 07:20:49

In Reply to: RE: GM20 questions posted by coolhand on June 9, 2010 at 01:23:41:

OK, so that's what it is! (MOV = Metal oxide varistor, right?) So it's job is really just to drop a steady 82V, putting the more negative end of the bias pot at -168V. That would seem to imply grid bias voltages in the range of about -37V to -70V as the bias pot is adjusted, which seems like the right sort of ballpark. Is there any part number on the MOV, coolhand? What kind of physical size is it, I wonder?

And for the balance, I guess the offset pot is really just making very fine adjustments to the 51+51 Ohm fixed resistor pair.

Thanks everyone, for all the help and information!
Chris

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