Carbon Comp Resistors for Certain Modules?

[fretless]

So as I recall...

Carbon composition are selected for the plate resistor of a tube amp because the value changes (increases) under high voltage transients. This adds to the fabled tube amp compression. So these are 100K resistors with a plate supply of roughly 180V to 260V. The inductive component is very small, so in a resistive coupled amp with caps between each stage this is a plus. On the minus side they drift, are noisy, and are hard to find these days. In tube amps they change value as the amp ages under power.

Carbon film are the poor man's metal film resistor. These have the spiral cut and so exhibit some inductance. They have more noise than metal film, drift more and are offered in less precise values. Back in the day these were the resistors you could get for cheap.

Metal film are spiral cut, precise and low noise. Back then they were 20 to 50 cents each (like one op-amp now).

Metal oxide are spiral cut and available in 2W and 5W power ratings. Most types have high voltage ratings and are flame-proof. These are the plate resistors that I use in my guitar amps.

All the other through-hole stuff is very exotic, like copper lead wires (no e-mag pickup), tantalum construction (?), wire-wound (inductive). I have purchased 100 Meg Ohm resistors in the recent past, you don't want to know why.

Given the price of metal film these days (1% 50 ppm Xicon is 4 bucks for 200) if you use these and your circuit still has a problem, you can rule out the resistors.