There's a guy that has done MAJOR re-design of the Dyna PAS-2 and PAS-3 using very advanced computer simulation and a lot of know how. His name is Norman Koren and he's had more than a few articles published in various tube / tweaker mags.
I intend to modify my Dyna pre using his basic suggestions once i get the time. Don't know if he's done anything with the amps, but you can try checking his website. It would at least give you an idea as to what is involved in modifying / upgrading a unit of that nature.
AVA ( Audio by Van Alstine ) may be another good source for parts and schematics but i don't think that his ideas are near as progressive. Sean
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http://www.normankoren.com/Audio/
I intend to modify my Dyna pre using his basic suggestions once i get the time. Don't know if he's done anything with the amps, but you can try checking his website. It would at least give you an idea as to what is involved in modifying / upgrading a unit of that nature.
AVA ( Audio by Van Alstine ) may be another good source for parts and schematics but i don't think that his ideas are near as progressive. Sean
>
http://www.normankoren.com/Audio/