ARC Ref 6 tube replacement

The Ref 6 uses 6H30P tubes, which is a Russian tube that has no substitute.  The older DR version is considered to have better sound, but they are very expensive and rare.  So unless you're willing to pay the price for the 6H30P-DR, there's no tube rolling for the Ref 6, except for the 6550, of course.

tomcy6.......What would you replace the 6550 with?

hello tatooedtrackman , I got the suggestion from the tubedepot some time ago for replacement of the blacklabel , they suggest  the SED 6550 black sable . My tube replacement for the REF 3 by the blackplate tungsol gave me the following impression : bass tighter , more refined and more resolution .

hansk46 .....Thanks for your suggestion. I also thought about trying the SED 6550 black sable. Was also wondering about the NOS Tung Sol compared to the new remake Tung Sol 6550.