Mesa Boogie Tube Kit, Upgraded, Express 5:25 Amplifier
This is an upgraded Tube Kit designed to replace all of the tubes in your Mesa Boogie Express 5:25 Head or Combo. It includes the upgraded SPAX7 preamp tubes as opposed to the standard 12ax7's.
The Express 5:25 Kit includes:
2 x MESA Matched EL84 Tubes - 6BQ5 EL84
5 x MESA SPAX7 Preamp Tubes (upgrade over standard 12ax7)
MESA SPAX7 preamp tubes are a low noise super-premium grade substitute for any 12AX7 positions - They are a "Special Requirement Preamp Tube" that possess an even higher standard of overall performance, due to their incredibly low sensitivity to microphonic noise - This is the ultimate preamp tube to use in all critical gain stage positions - It is the absolute best of the best!