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

[Jacques Fortin]

One of the "features" of the CC resistors is the variation of their value with the instantaneous applied voltage, which leads to a form of distortion for the audio signals.
Some like it: they call it "vintage sound"....
The metal film/metal oxide film parts do not exhibit that behavior, and they do not absorb moisture with time as the CC does.
It is true that the hi-value, high wattage MF parts are hard to find, but the MOF are more commonly available (from Vishay and other mfg.)
Regarding the price, if you look at Mouser or Digi-Key, the CC (especially the Stackpole ones) are not really less expensive than their MF counterparts.
I used to buy my leaded MF resistors from "surplus shops" around Montreal, but due to the proliferation of the surface-mount components, they are now also hard to find !

73, Jacques, VE2JFE