so i plan to change my tubes in my peavey 5150 block letter
but i don't know which to choose.
i have heard that mesa tubes sound great in 5150's

the sound im going for is a metalcore sound
if you have suggestions let me know
No matter what you order, be sure you order from a personal supplier.

(Like www.eurotubes.com).

The problem is that the 5150 is a "fixed bias" amp and they are usually biased quite cold. If you order from someone, be sure you tell them you're ordering for a 5150 so that they can get you some tubes that run hotter.

Personally, I've used JJ 6L6GCs in the two 5150s I used to have. Those were the best sounding tubes I used (I also tried Sovtek, Groove tubes, and Electro-Harmonix).

Go with the JJs. They have that darker and heavier sound that suits Metalcore.
1979 Gibson Les Paul Silverburst
James Tyler Variax JTV89
Schecter C1 Classic
Ibanez RG520QS
Greg Bennett Torino TR4

Mesa Boogie Dual Rectifier
GSP1101 & Pod X3 Pro
Peavey 5150 & JSX
Bugera 6262 & 333XL
Carvin V3
Spider Valve HD100
I've never had good luck with Mesa tubes - I think they are cheap, generic tubes that Mesa just slaps their name on. JJ's or Phillips tend to be people's go-to 6L6 for high gain amps. I personally like Svetlana tubes - they can handle extremely high currents and hot operation (what I use in my Soldano, which is always cranked).
Suhr Custom, Flaxwood Rautia or Grosh Tele thru
HBE Medicine Bawl Wah
Analogman BiComp
Texas Two Step OD
Fulltone Ultimate Octave/Fuzz
Boss CE-2
TC Nova Delay
SLO-100, 65 London or Bogner Shiva
Ask me about any of this stuff!