Tube life expectancy: Stax driver unit SRM-006tII


Hi, does anyone have experience with the origin and life expectancy of the 6FQ7/6CG7 in the Stax earspeaker driver unit SRM-006tII? Since Stax are very strict about this, I haven't opened up the case, so I don't know what make they use. Since I use the earspeakers not regularly, I don't leave them powered on when not in use. Any rolling findings with the unit?
Thanks
karelfd

Showing 1 response by audiolee

Tube life in these units last 5000 hours and up.
Mazda(Great Britan)6CG7 from Upscale Audio at $120 a pair might be a great candidate for rolling.