Tube Question

I been reading people mentioning the KT 150.
IMO I think the KT120 is substantial in the m125 but I do not know much about the 150's.
Is anyone here using the 150's in the m125's.
Also what bias level are you using? I know the 88's and 120's have a .500 setting for two tubes but is it different for the 150's since they run hotter.

Thanks

https://www.newsensor.com/pdf/tungsol/kt150-tungsol.pdf  

http://www.tungsol.com/specs/kt120-tung-sol-specs-curves.pdf  

Looks like distinctions without differences.

Writing for myself, I would think/hope that New Sensor would spend its time making a better, more reliable 120 than create a 'new' tube of not-much distinction.

There are a handful of amps out there being sold as KT150 amps but really they're just KT88 amps with KT150 tubes. Doing just a quick search I found one company that seems to make a true KT150 amp. 100W/ch monoblocks for only $50K/pr.

Clearly designing and building transformers for the KT150 is a daunting and probably expensive endeavor. Very few seem to want to risk producing an amplifier for an expensive tube made by only one company.

If I knew how to roll my own transformers I would like to build a proper KT150 amp.

I'm still waiting to hear from anybody who has bought a quad of those EAT KT-88s at $1600.