Just picked up this amp for $100 from FB marketplace. Very good condition and the clean tone is excellent, as is the spring reverb. However, the distortion channel isn’t working the way I think it’s supposed to. YouTube clips show that it’s more of a fuzz tone, but even with the distortion turned up all the way it sounds like a slight clean boost at best. Any ideas what I can look at? I know zero about amp circuits, but do my own guitar electronics work. Is it worth having it checked out or should I just enjoy the clean channel and use pedals for dirt.