Hey, thanks everyone for your replies and opinions that I am taking on-board.
I'm gonna have to get a good loud blast again on the 9100 50/50 and see what I think, It's been a while!
The 8008 80/80 valvestate that I'm using at the moment is transparent in the rack. I mean, it is transparent and invisible between my ADA's, effects and the speaker which I think is a good thing as it only acts to amplify what I have before it in the chain without coloration.
There is a switch on the back to select from normal to 'valvestate' sounding which only adds in an RC series low/mid pass filter circuit at the output stage after the power transistors.
I just keep it on normal though. It's a very good amplifier, light in weight well designed and 1U rack space.
I did modify it and installed a 12V fan that kicks in with a 50 degrees celcius thermocoupler bolted to the heat sink via a simple little circuit.
I know,,,, mos-fets don't mind getting hot and they can operate hotter than hell, but my concern was what do I have racked above 1 for 1, with no space. Thats why I moded with a fan that kicks in at 50 degrees. if the heatsink is at that tempreture it's loud, and you will never hear the fan.
But,,, back to the 9100 50/50,,, A good option with the 9100 50/50 is that with some slight modification, I could select what type of valves to use for each channel.
Like, I could have 6l6's on the left and El34's on the right, or I could try out the KT77's or even the 6CA7's, any of them, left or right or on both sides in pairs. It provides that optional platform with slight modification.
Who knows yet, money is tight, LOL
Thanks for all your replies ADA'ers, it's very much appreciated from yous all, I just need to make a decision.