[AMPS] SB200 SoftKey Instructions

[Tom Rauch]

> Also, general question...
> In the process of rebuilding the power supply board of the same sb200 and
> would like comments on the replacement of the equalizing resistors across
> the filter caps and the two other associated higher wattage resistors.
> Would it be sound to replace them with low inductance wirewound types?
> Having a problem locating larger wattage carbon/film replacements.

Carbon and carbon film resistors should never be used in 
equalizing resistors, or as voltage divider resistances.

Carbon resistors have a tendency to cycle through very large 
resistance changes with exposure to heat, at times drifting up and 
at times drifting down in value.

Use metal film or wire wound resistors, and they certainly don't 
need to be "non-inductive" types! After all, they are operating at DC.

 
73, Tom W8JI
w8ji@contesting.com

--
FAQ on WWW:               http://www.contesting.com/FAQ/amps
Submissions:              amps@contesting.com
Administrative requests:  amps-REQUEST@contesting.com
Problems:                 owner-amps@contesting.com