Silver Supporting Member
How different are the 5F1 circuit to a Silverface circuit? I know anything is possible, but is it so far off that you'd have to just do a rebuild?
5F1 does NOT have a tone control. Volume control only.The two main differences are: the 5F1 has a single tone control and lower voltages. The SF Champ has a Blackface-style tone stack (bass & treble with fixed midrange), which robs the amp of more gain than the simple "tweed" style tone control. It wouln't be that hard to rewire the amp to have a tweed style tone control. You'd have to drop the voltages a little, too.