EDIT: And wow, I pretty much disagree with everything in Notuern's post As far as tone-stack goes, If it ain't broke, don't fix it IMO, and more tubes for independent channels means more heat and more power consumption! (strain on the transformer). And the complexity of a built-in power soak feature could be forgone in favor of a half-power switch methinks
DI output
Line out with preamp gain
Built in Tube Screamer (can't be that hard) <-- this would be so key
Adjustable bias
Power soak
Separate ohm options for cabs with different ohms (ie one 8 ohm and one 16, not sure if this is even possible)
Presence knob
Tonestacks are annoying as fuck imho.. because eventually you either modify your amp or get a new one just because the f-ing tonestack wont let you dial out the frequencies you dont like..
And you do realize that to get 50% max output volume on your 100w amp you would need to about 10w, not 50w?
And 10w is still pretty damn loud if you crank it.. btw, i have 100w, 50w and 25w modes on my Carvin, and it does a fuckton to the sound, due to the fact that the 100w mode uses 4 tubes, 50w uses 2 tubes, and the 25w uses 1 tube.. so I'd definitely go with a powersoak over a half-power switch.
And i agree about that part with the power consumption etc. with dual sets of preamp tubes, but i want cleans with loads of headroom, and i dont really like that smooth "Steve Vai-distortion".. so its impossible for me to get the sound i want with the same preamp tubes in both the clean and od-channel.
As far as having a bunch of switches to get different types of sound, thats not really one of those features i would use extensively.. but it would allow you to get a much more versatile amp that can do pretty much anything(Meaning that more people would be satisfied with the amp.).
Versatility never appealed to me, I prefer not having as many options (as I need to be forced to stop tweaking or I never will until I get pissed and give up ), and I'm not sure how using one or two power tubes instead of four makes any difference in sound besides earlier breakup, but maybe in practice it's not that simple (if it is though, I don't see why a half/quarter power switch wouldn't be adequate).
As for the 10-band eq, I guess I would reluctantly go for it, BUT, only in the spot it's in on most amps (I guess that would be post-distortion; my point is having controls both pre- and post-distortion a la the Mark series amps would be bad enough IMO, but if they were both 10-band eq's my head would seriously explode :Spin: )
...Class A - A/B switch OR knob...
And honestly, if you have 2*10 bands, 10 before and 10 after the preamp, you wouldn't have to tweak those BEFORE the preamp unless you feel the need for it.. having them set to 0 would be just like not having them there at all you know.