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old thread and late reply BUT I have solved the hiss problem :!: The Mesa F series as well as the Studio 22, Maverick , Blue Angel, Dual Caliber and Express series all suffer from very high background hiss because they all use a 2 resistor and two capacitor filter right at the first tube stage...

the problem with your stock speaker is most likely a frayed lead in wire check where the lead in wires are soldered to the mounting terminals - use a multimeter ;-)