Hey Everyone! Just to clarify, the KT88 option for the models that accept multiple tubes types is just the difference of the power tubes themselves. No changes to the circuit, output transformer, etc. as it's not necessary. The cost difference is merely the wholesale cost difference of the tubes compared to 6L6s or EL34s. No matter which tubes the amp ships with, they can be swapped at anytime for another type with just a bias adjustment using the controls on the rear panel.
While KT88s have the
potential to put out more power (as they do in the 200W Mother model), they won't unless the amp is designed to do so (different transformer specs & power supply). Therefore, putting KT88s in the Hellhawk, Decolonizer, Sister, or Street Sweeper is only for tonal variation and convenience, rather than power increase. And on that note, the tonal difference is practically negligible considering all the other factors in the signal chain (and at the volumes most of my customers plat at!). The differences are more apparent when overdriving the power tubes, but that does not happen often or in isolation (meaning there are other types overdrive from the preamp, driver (and pedals, of course) co-mingling, and so it's hard to tell if what you're hearing is the difference of the power tubes or not.
Another consideration is that what one may perceive as a difference in power tube type alone is sometimes partially the interaction between the tubes, output transformer, surrounding circuitry, and bias point. Basically, it's an 'everything affects everything' situation, even when you think you're just A/B'ing tubes. Most people rarely get to A/B tube types in the same amp back to back, and often attribute the tone of their amp to the power tube type. For example, 6L6 = Fender. Put EL34s in a Fender circuit and it still sounds 99% like a Fender
I think the idea of KT88s being more 'HIFI' is also a bit of a myth. There are lots of HIFI amps that using all varieties of preamp and power tubes, which have accurate sound reproduction. It's really the circuit that matters most. So why offer different tubes types? Because I really have no reason not to, and while the differences are subtle in my opinion, they
are there and justify experimentation.
I've been working on a new website to replace my current lame one, and I really wanna do some clips comparing power tubes in the same amp so folks can decide for themselves. Hope that helps, and sorry for the rant!
...Oh, and while I'm here, as far as cabs, we can really do anything, but custom charges may apply. We actually already have a 6x10 sealed bass cab, and ported 1x15 and 2x15 bass cabs. We have a 6x12 for guitar too. I've just been too busy to put anything online about them. Lots of stuff possibilities!
Thanks again for all the interest and support here. It's really appreciated.
Alex