I would call Leonard at Audio Research and ask him. Personally I would confine my tube rolling to the small signal tubes in the preamp and or cd player.
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Thx Elberoth2. Did you try the NOS 6550 Tungsols in the output stage of the Ref 110? I guess having never done this before, I am at a loss as to where to start in terms of which tubes to replace and with what and how that is likely to change the "voicing" of my system. By the way, just to fill out the picture, my ARC components drive Thiel 2.4s with Nordost Heimdall cabling and Shunyata Hydra 8 handling power conditioning. I am interested in experimenting with tube rolling to see if I can get a bit more bass out of the Thiels and to see if I can introduce a touch of warmth (not too much) across the frequency spectrum.
BTW Elberoth2, you mention you used to have my ARC components (which is what is still listed in your Systems link). I am wondering what you changed to - just curious. And, beautiful listening room set up - very nicely done.
Finally, i looked through your threads and couldn't find the description of your tube rolling experience with the ARC components. Would you mind posting a link of the thread where you discussed this? Thx very much.
Cmalak - unfortunately, I did not have a chance to try NOS 6550 TungSol Black Plate in the Ref 110. Those tubes are very hard to find, and are VERY expensive. Last time I checked, Tube Store was asking $500 - each !
8 x $500 = $4000. That is way more than I'm willing to spend on an octet of tubes :-)
Ref 3 is another story, as you only need need one tube. I have discussed it here:
Hope this helps.