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Ironically the hum has since dissapeared (either that or my hearing has ) so the urgency to change them has gone.
I'll probably replace the Jmp-1 valves first to see what that does to the sound.
Ive now replaced both the valves in the Jmp-1 but havent been able to use the rig at gig volumes yet.
Both the valves replaced were marshall branded so i kinda think they're the original ones.
I used the rig on sat for the first time at volume and i gotta say the new valves have definately added something.
The amp has much more growl now, more presence and its like a totally different animal all together.
I cant believe how much difference there is consdering that most valve purist say the valves in the jmp-1 dont do much.
In fact the valves noticeably affect the tone - that's what they're for. Most of the distortion is provided by IC gain and clipping diodes, it's true - but then that's fed through a valve tone stage. The clean modes are almost all valve.
But if there's a *huge* change, it's probably because the old valves were knackered .
"Just because I don't care doesn't mean I don't understand" - Homer Simpson