audio Research REF 110 and KT 120 tubes

I also read somewhere that replacing the 6550`s with the KT 120`s upped the power by 20 watts per side. Or maybe 20 watts total. Can anyone confirm that?

I was told by ARC that not only was the KT 120 a better sounding tube. That it would increase the power of the Ref 110 to approx 130 wpc. The KT 120 is a drop in replacement in the Ref 110.

Lostbears...ARC told me the same thing. They also said that since they are drop in replacements (i.e., no change in bias settings from when the 6550s are in the circuit), they are being run much more conservatively at the existing bias settings so that the tubes should last longer and theoretically they are expecting less in the way of tube failures. I recently had my Ref 110 retubed by ARC with 6550s so I will probably just wait before retubing again with the KT120s.

I am due for new tubes in my Classic 120's. Wonder if the KT120 would be a drop in as well. It seems that the SED 6550C Winged are really getting scarce. Not too many tube sellers have them anymore and i would need 2 sets of matched Octets. I will call ARC and find out.

Smoffatt, probably not without modification. I believe that the bias pot range may be too small. If that is the case you would not be able to properly bias the tubes. You might need to changed the value of a few resistors. Not that big a deal. I had it done to a Classic 60 years ago. ARC sent me the proper resistors along with a schematic of where to replace than. There might also be clearance issues. The KT 120 tube is much larger than the 6550 tube. They may not clear the cages.