New KT150 tubes?


Has anyone any experience with these pretty new tubes. There are already one or 2 amps I know of, that use them. The review of one of these amps in a UK magazine suggested they were a little warmer and more natural sounding than the nearly new KT120's

The article also suggested they were a straight swap for KT120 based amps, with no adjustment necessary. They are more than twice the cost of KT120's, but still not too costly compared with NOS tubes. I know changing from KT88's or 90's to 120's. did require some amp modification. I have an ARC reference 75 and might want to try the new tubes at some point, ARC don't seem to have a customer E-mail service, to ask the question
david12
To ARC tube amp owners, this is Kalvin Dahl's response:

"Until engineering tests the KT150s I would not use them in the Ref 150."

I think it's a fair inference that Kal's advice covers all ARC tube amps.

Patience, patience.
I will. I have a lot going on in my system. Fairly new amps, new Dueland caps, different DAC, DC filter. It never stops!
Bifwynne If you or anyone else could report back with a definitive answer from ARC, that would be great. To just remind you, the UK importer said the Ref 75 should be OK, not the 150 and above, but I would rather hear what the company has to say.
It may prove to be the case that the Mains / KT ratio of the Ref 75 might receive sanction , however we may speculate that the Ref 150's 8 x KT / Mains ratio may prove too near the Red Line without major surgery , if at all.

However it would seem prudent to await the 'The Word' from ARC central on this matter regardless of model , especially for units still under warranty .
Hopefully we may hear some definitive direction from ARC in the not toooooooooo distant future as to which models , if any , may be certified to utilize the KT150 .