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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
bifwynne
2,206 posts
 
Gary ... I don't like to guess or talk about stuff above my pay grade. So, I checked the New Sensor web site and copied the following specs:

KT-120

Plate resistance - 3000 ohms
Heater characteristics - 1.70 to 1.95 A
Plate current – 135 to 165 mA
Plate dissipation – 60 watts

KT-150

Plate resistance - 3000 ohms
Heater characteristics - 1.70 to 2.00 A
Plate current – 150 to 180 mA
Plate dissipation – 70 watts

I really don't know if the increase in plate dissipation current or plate current draw is electrically significant. Perhaps you can weigh in. However, to the extent that plate resistance is an important spec, the two tubes share the same stat.

Regards,

BIF
hifigeek1
770 posts
 
I don't have an answer for you. I will have to differ to ARC and wait, but I am getting impatient. I will ask again next week.
hifigeek1
770 posts
 
I was at The Show in Newport Beach this weekend and walked into the Alon Speakers room hosted by their designer Carl Marchisotto. Low and behold he was running a ARC Ref 75 with KT150's in it. He said, and these were his words, the differences between the KT120's and the KT150's "were transformative." No other room at the show including ARC dealers, were running KT150's. I did not ask Carl where he got the KT150's from or if ARC was a co- sponsor of his room. The plot thickens.
wolf_garcia
6,686 posts
 
No...we need to wait...when 120s were thought to possibly be a threat to mankind itself and reported amp issues relative to higher heater demands were exactly zero...zero...we were cautious and...well...uh...nevermind.
jazzonthehudson's avatar
jazzonthehudson
277 posts
 
Appreciate feedback from someone who tried them in CJ gear (their techs stay on the official stance, not even supporting the KT120s). I am pretty happy with the KT120 in my LP140m, seeking more depth in imaging and a bit clearer highs.
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