I have a silverface super reverb that has been modded to blackface specs. The first input on the left side is now a gain channel and now has a mid switch where the second input is. The vibrato side is my clean "channel". I run an ab to switch between the "channels" It is loaded with Celestions vintage 10s. The master on the dirty side when cranked to about 5 or 6 starts to grind a bit but it doesnt get that "singing" lead tone that I have heard Derek Trucks or Jimmy Herring get on the project Z album. The bass gets very flubby when overdriven, even with an analogman ts9. My tubes are rca black plate 6l6s with nos phillips preamp tubes, no deficiency there! I have no problems with the cleans, just the harsh flatulent overdrive. The tranny isnt an issue,Mercury Magnetics. I was thinking of sending it to Lord Valve for an overhaul, I know these amps can sing if set up right. Any reccomendations on mods or builders who can help with my "project"? I was thinking the vintage 10s might be an issue,maybe something Weber would help. Also, forgot to mention that it had a cap job and has a cathode bias mod as well.Any suggestions?