My trusty Jansen Bassman 50 started playing up tonite... Initially the fuse had blown earlier, so that was replaced. The old Carvin 6L6s that I sometimes run in it were pretty clanky and delivering sod all, so I popped back in a pair of good condition GT 6L6s (which normally give the amp a real boost in the headroom department). Now, playing softly is OK, but strike a loud note and the amp distorts...looking behind the 6L6s are dimming when I dig in. Is this dodgy output or preamp (12ax7, 12au7) tubes causing this, or something nastier? Another question too: why does my Bassman 50 (~62w) have 2 huge electrolytic caps (filters I presume), yet my Bassman 6/35 (~45w) has none? Both run 2 x 6L6s, with 12ax7 and 12au7 preamps and gain stages.