I own two Inspire amps, a KT88HO (6922 version) and a KT88PSE. The tube designation is really how the amp is voiced and supplied with tubes. There
may be a difference in bias voltage, but I doubt it. These amps can run just about any Pentode or Beam tube from EL84 to KT150, though some may need socket adapters. The KT88HO will give 5wpc (6V6) to 12wpc (KT88). The amps a a lot of fun because you can tube-roll to your heart's content, though with the newer PS the effects of changiong the rectifier tube are reduced.
Dennis Had builds and signs all of these by hand. He uses custom-would iron (the power transformer is overbuilt) and great quality components. He does not voice these to sound slow and romantic. He is generally a fan of Munforf, Audyn and Jantzen capacitors which I have found to give a more modern sound.
You may wish to spend a few hours here:
https://www.audioaficionado.org/showthread.php?t=24170