2. amps-preamps
  3. 1018725328

What tubes to use for Audio Research SP-9 MkIII?

I have never opened the case on my AR SP-9 MkIII preamp. I called the guy who sold it to me and he says that it has Sovet6922 or called 6DJ8. A pair of Simens old new stock tubes 6922 made in Germany are for sale for $130 bucks...is the price of the Siemens tubes a good deal? Will the change in tubes make a significant improvement? I've never opened the case...how many tubes will I need? The AR users manual suggests leaving the preamp on all the time....how long will tubes last if the unit is always left on? Thanks,...Mitch
mitch4t

Showing 1 response by ed_sawyer

ed_sawyer
588 posts
 
Upscale won't sell any decent 6dj8/6922 types to people unless they bought their gear there. I'd recommend Amperex as the best tubes of this type...after all, they invented the 6dj8 frame-grid type of tube.

-Ed Sawyer
(Full disclosure: I have some of these for sale.)
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