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Mostly only used for cosmetics now. Unless you are actually working with RF, these things are just not worth the price, and the future headaches. These are not as noisy or drifty as those old silver stripe 10% resistors in your old Tweed Fender Whatzitmaster Pro, Brown, Champ, Harvard, Concert, Deluxe, Vibrolux, Tremolux, Vibro Champ Twin Princeton amps, but just wait until they are old enough to collect social security and they'll suck just as bad. This composite is hygroscopic so values can and will change with humidity and drift with heat. The MOJO FACTOR. If you want that audible mojo, the Chinese make some really cruddy carbon comps, and I know where to get them. You also get even more Nyquist noise, more shot noise, and more thermal drift as well as drift with humidity. These old resistors actually do have their places, and sadly where they would be the most useful in an audio application they are also the most vulnerable to having problems too, and that's up in the Meg Ohms ranges, where carbon film and metal film resistors are really inductive. The ONE redeeming factor with carbon comp resistors is they are NON-INDUCTIVE! These would show up in old analog TV tuning circuits otherwise a carbon comp would either oscillate, pick up stray RF noise, or do both. I prefer the Brown Devils and the ceramic carbon comps, but they are now so expensive and so seldom used, almost no one carries them anymore. Modern stuff uses a planar thick film, instead of a spiral cut film, so those are all modern non inductive resistors, which can dissipate upwards of 500 Watts. $$$$$$ Yes those are expensive, and it makes these look, a little less expensive. Honestly.... Just uses carbon film, and metal film in key places. If you have 1 Ohm resistors for bias setting buy the 1%, 0.5% or 0.1% precision resistors, or you will destroy an amp, so DO NOT EVER USE THESE FOR A BIAS PROBE RESISTOR! !!NEVER EVER!! If you want to use them everywhere else, cool, but not for a bias set probe.
