Replace the stock tubes. I have used many brands of tubes (Teles, Mullard, Mazda, Amperes, Solvtek) and settled on Psvane Treasures fron Grant Fidelity. I also liked Gold Lion reissues.
First thing I noticed was how much more quiet the Psvanes were - less tube rush. Plus, the midrange was more fluid, not as harsh. I got the upper level of Psvanes when Grant Fid. forst introduced them - $75/pr.
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