So... i seen these things on guitarcenter.com they dont look like they do anything. What are they? Oh yeah and what are the best tubes to get that Rust in Peace/And Justice For All... sound for $20 or less... (for a B-52 At 100)
$20 will buy you one power tube. and preamps boost your signal to line level so a power amp can handle them, they are also mainly responsible for coloring your tone.
Cant pre-amps be anything? ie. pedals, multi-fx, signal splitters, channel switchers, etc.
um, no not really, a pre-amp has to boost the signal to line level at the very least before it can be considered a pre-amp.