hi guys I have my TSL that just been re-tubed/ biased and sounds amazing!! But there's a little problem, My lead channel is kinda shrill and trebly. My tube combination is Marshall ecc83 in V1 and the rest of the pretubes are EH 12ax7eh (i don't know,but my amp sounds better with Marshall tube in V1) . And the power tubes are svetlana EL34. Any suggestion to tame my trebly lead channel and could you please tell me about the TSL's preamp tubes function/position.