New KT150 tubes?

Well the KT150's have landed and are in my Reference 75. No sparks, explosions or other calamity, oh and they sound pretty good too. Right off the bat, I would describe a tight deep base and a deeper soundstage as initial, favourable impressions.

As Tsushima1 indicates, this is only feedback for the 75, not the 150 or other ARC amps using more than 4 tubes. I am using the same bias as the KT120's.

David12 and Tsushima ... I took a close look at the specs for the KT-120 and KT-150. Take what I say with a grain of salt because I am not a techie, but the current draw, plate dissipation and impedance specs of the two tube types are very similar. I surmise that any additional power demands that the KT-150 would place on the power transformer and other relevant passives would not be significant.

And I continue to wait.

P.S. to David -- how close was the "slave" tube's bias spec to the "set" tube's 65 mV bias number? I ask because for some reason that I cannot explain, IME, the delta between Upscale sourced KT-120 "set" tubes and "slave" tubes specs can be as much as 5+ to 8 mVs??? Not so with ARC matched tubes.

Gary (Hifigeek1) ... still no official word from ARC yet about dropping the KT-150s into its "standard" current Ref amps???? Has the new G series gear hit the stores yet???

In a private message from Kal a while back, he mentioned that the GS-150 is the best sounding amp ARC that has made to date. He did not answer my question about how the innards of the GS-150 changed from the Ref-150. On paper, they spec identically.

Reading across the forums it would appear increasing numbers of Ref owners are loosing patience with Obfuscation Central and are electing to run with KT150's .......

"I ordered 8 KT150s for my Ref150 from Upscale Audio on Friday - I had them overnighted. Before installing the KT150s I re-biased the original KT120s to the specified 65mVDC. I have a device that plugs in between the power cord and outlet letting you see how much energy you are consuming. It also displays real time wattage and amps. My thinking was to take a reading with KT120s installed and then with the KT150s (set to the same bias) level to see how much additional power the KT150s required. The results are: KT120 (331 watts / 3.04 amps) and KT150 (336 watts / 3.10). The difference does not look significant. I don't know how really meaningful these numbers are and would appreciate anyone's thoughts.
The installation went perfectly - I have had no issues so far. I took temperature readings of the internals and the case with an IR thermometer and did not see notable changes.
I have about 6 hours on the KT150s and I am glad I made the switch. Improved bass, more space around instruments, more meat on vocals and a huge improvement on the sound of guitar strings. I will post additional comments when I have more hours logged. Thanks to all for the great information influencing my switch to the KT150s! "

I just ordered a quad of KT150s for my Jolida 502p because I live on the edge...also they hit my magic cheapness number on Ebay, so I guess I live on the edge of cheapness.