Mesa Boogie SPAX7-A Preamp Tube

The Mesa Boogie SPAX7-A preamp tube is a super-premium grade substitute for any 12AX7 tube position. It is a "Special Requirement Preamp Tube" that possesses an even higher standard of overall performance, due to its incredibly low sensitivity to microphonic noise. The SPAX7-A is the ultimate preamp tube to use in all critical gain stage positions. Mesa Boogie starts with the finest tubes from around the world, tests and matches each one under simulated operating conditions to the tightest, most demanding industry spec. Then backs them with the best warranty in the business.

The ultimate preamp tube to use in all critical gain stage positions