Mods for DYNA ST-70, What do you think??

I would look into some of the tube specialist forums. I'm sure that there are plenty of various opinions on this.

My take would be to replace all of the aging capacitors, clean all connections as best possible and then re-flow all the joints with a high grade solder ala Wonder, Cardas, WBT, etc.. This will basically maintain the integrity of the existing design while allowing it to function at top performance.

Obviously, you would need to check the tubes and replace accordingly. My one suggestion in this area is that if one output is bad, replace all of them at the same time, etc... Same goes for the driver section. Running tubes of different ages, production runs or brands can contribute to both lower performance and increased wear and tear.

Once again though, i would suggest checking out the various tube resources that are available to you to find out what tubes work best in your specific unit. Sean
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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/