[R-390] Replacing carbon comps with metal film resistors

[Perry Sandeen]

Yo Bubba Dudes!,
IF you go the route of replacing the carbon comps, understand that theirRF characteristics are unique. No other resistor out there does quite the same thingat HF that a carbon comp does. There may be some fiddling involved..
That's very interesting. I never new that.
Fortunately all resistors in both the A and SP 600 are only used as voltage dividers or in audio for gain increase.
Before Dr. Jerry got hounded off this list by moron trouble makers, he did experiments to see if the spiral trimming would cause any inductance problems at the RF frequencies us B/A aficionados use.  He found no problems whatsoever.
About 12 years or so I make a bulk purchase of 4,000 .5W MF resistors and made resistor kits for both the A and SP 600.  I sold over 25 kits of each and no one ever said that they had a problem. 

So I guess from Bob's comment is that all the *chip* resistors we see now are made out of something besides cabon.
Regards,
Perrier