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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
4 responses Add your response
cyclonicman
693 posts
 
I use the Mazda's from Upscale. Good News is that they are only $80 per pair not $120.
paul9000
2 posts
 
Fwiw some folks on diyaudio.com prefer the 6FQ7 over the 6CG7. Any comments on the differences?
karelfd OP
476 posts
 
Thanks, in particular for the rolling recommendation since I haven't found a great deal of information on this type so far;
audiolee
2 posts
 
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.
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