Re: Tube Recommendations for MEsa Tremoverb
I like three power tubes in my Mark Series Mesas. The Mesa 6L6 is a solid choice. The Groove Tubes 6L6-GE is very good sounding, but they can be inconsistent. My favorite is the Winged C/SED, and especially with their EL34s in the Simul-Class sockets. These have been very consistent, and they hold up well in these high-powered combos.
The Mesas are plug and play. If you use GTs, get them in the 4-6 range. Get the SEDs from a vendor that knows the correct milliamp rating for Mesa amps.
For preamp tubes, I like the GT12AX7-Mullard clone, but you can't get them anymore. I find using all JJs make the amps too dark sounding. I lke the EH version can sometimes sound a little...harsh, tight, etched, bright, detailed...pick one. Tungsols and the EH Mullard might be good choices. And the Mesa pres sound good and they have the best warranty. You may find that using a mix of the various brands can give you the tone you want...known as amplifier blueprinting.
Have fun!
Bill