Sorry guys I should have been specific. Currently I have the classic JB/Jazz combo; I like the tone a lot but its not what I'm looking for, it needs a tad less high end, some more bass and mids but still with the clarity for full chords. I'm actually also thinking of swapping the tubes on the 6505 to el34's to give it a more british sound. I really love my midrange so I've always taken to that marshall sound but with an extreme metal twist.
1. Replace your JB/Jazz combo with Bare Knuckle Pickups that suit your playing style and give you the sound you want. Normally machine wound pickups like Duncans don't give you good clarity with the full chords. Scatterwound pickups pickup the sound from your guitar in ways you'd never imagine, and never mush up when playing hi-gain chords.
2. Before you change your amp tubes, make sure you give yourslef time with your pickups. If you still want more bass and midrange, and really want to change your tubes, I'd recommend E34L tubes over EL34. Mabye even KT77's. The EL34's are somewhere between 6L6 and EL34, but the E34L's are just in a different league for players with your needs. I'll give you a description below of the 6L6, EL34, E34L and KT77. I've copied and pasted from Eurotubes who sell JJ tubes.
6L6GC ( 5881 )
A truly classic sounding 6L6GC. The lows are deep, big and round. The mids are very harmonically rich and natural while the highs are thick, creamy and very detailed. This is the tube for Peavey, Fender, Mesa, Soldano, Bogner ect.EL34
This tube is as close to an NOS Mullard as you can get although I have to given mention to the Svetlana EL34 which is close, it’s very good but I like the way the JJ tubes break up better. They are very smooth and have the biggest low end of any current production EL34. I still prefer the JJ E34L for most applications simply because of it's extended low end and the fact that it's tighter and punchier.E34L
This tube has all the tonal qualities of the JJ EL34 but it has an extended low end response and is a little punchier and more aggresive so I use these in all Marshall, Mesa, Carvin and just about any high gain guitar amps.KT77
A truly beautiful reproduction of the original KT77 that will run in place of any EL34 type tube. A little bigger low end with a great chunk and a nice sizzle on the top end. The breakup is smooth and a bit less aggressive than the E34L's.