As I go through replacing components on my Vibro Champ, it keeps sounding better. I've read countless times about how much different carbon composition resistors sound vs metal film, though the latter apparently has much less noise. My research is telling me that the metal film is the way to go in the power section, but that carbon is preferable in the "tone" parts of the amp. I'm just curious, which specific resistors would benefit from the "mojo" ( ) provided by the carbon composition??