power tube replacement

  1. S

    MT15 Replacement Power Tube Selection

    My older MT15 has the factory installed RUBY 6L6GCMSTR (short bottle 6L6) power tubes. Since I've played the MT15 5-10 hours per week for 2.5 years, I'm planning to replace the power tubes soon. I love the sound of the Ruby tubes and clearly they have lasted well, but they are currently/no...