| The Fireball definitely needs to have the presence waaaay down, to around 2-3 at most. Everything above that is just fizz and hiss. When I owned one i had the treble around 7, mids around 4 or 5, bass around 4, gain around 5, and presence at 2.5.
The amp also benefits from a warm, low to mid-gain tube in V1 and a proper biasing. |