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
Btselect - Forgot to ask. When you compared the KT150's were they fully broken in? I ask because when my KT120's were new I really liked them. After 100 hrs I had to take them out. Too forward and a bit grainy. I loaned them to a friend who said he loved them. He put about 150 hrs on them when I got them back. I tried them again although better (very linear) I also replaced my driver tubes (Telefunken 12at7's) with some warm sounding Mullards which helped even more but still not as good as EiKT90's.
Lissnr, Congrats on a terrific system and I would love to hear it. It's unfortunate not enough audiophiles get to experience Paul's creations.
Just sent off another e mail to Kal at ARC about the KT-150. I'll post his response when he comes back to me.
If ARC starts using them in their Ref series amps i would likely want to have a listen to a REF75 with those inside before making a decision on a REF150 with KT120's.
I would like to replace my aging Classic 120's although they were upgraded by GNSC in 2005. I am using 8 SED 6550C in each of them and they still sound fabulous. Just looking at getting something else in the ARC line with close to same power output but with fewer tubes.

Let us know what Kal says.
Thanks Knghifi, Paul's work is truly SOTA it just takes a lot of time to build them one at a time and there's no substitute for that...
As for ARC products I'm hearing such great things about the Ref 75 and I'm sure we would all like to know about the 150's in there too. Keep us updated...my guess/hope is that they will work??? and we all will be in for an even further treat. Good luck