that preamp would be a fun one to gut
Your a heretic to even suggest such a thing. 
Do you realize that this pre-amp uses 100% fets running at over 100vdc power rail? This, grasshopper, was the peak of analog engineering design back when electrons were not ordered to simply turn on or off, but rather gently caroused into audio blissful movements.
Seriously this thing is designed and built like a piece of expensive H.P. test equipment. It has a passive vertical mother board with about six plug in boards. Nasa would have no problem letting with go on board a space craft. Except maybe for the weight penalty. These can fetch to $400 or higher on E-bay at times.
Lefty