Bob Carver LLC has been purchased by Emotiva

Not sure about KT150s, but I used KT120s in mine for 100 hrs now. No issue

Yes you can bob confirmed the KT150 tubes perfectly fine on both amplifiers.

back in the early years bob carver amps I felt was not up to par I cant speak on his tube stuff ,I did buy 2 xpa1sfrom emo for the price great deal and they sound great ,yes id love to have mcs or krell or a lot of other stuff but this what my pockit let me buy

Not sure about his SS Gear, but the tubes when modified are sounding very nice. The Internals of the amp looks old school. I don't regret the purchase. just pissed off about the warranty issue and the price change. The amps are very nice and musical. At first it did have a slight darker tone to them. Done a few caps change and it really shines now.

Only good thing about without warranty is now I can "all in" on all the modification :)
I did change: volume pot, 5 coupling caps, 6 resistors, swapped in KT120s.
Sweet and well-designed tube amps