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RE: St70 !?

Posted by petercapo on March 4, 2017 at 08:31:39:
bare, I don't know exactly what experiences lead you to your conclusions, but have you seen this recent landmark study of the original Dynaco Stereo 70? It's really worth reading for its objectivity alone: Gillespie Study of original Stereo 70
As far as the "variants," or "modded" versions of the Stereo 70, they have had a pretty well established following, and people seem to like them a lot. I personally have not heard them, but the evidence suggests they sound good and represent a good value, like the original Dynacos did.
As far as the original Dynaco Stereo 70, I built a new Stereo 70 to the original circuit and added some of the same kinds of performance enhancements that the modded versions use. For example: individual bias adjust, increased power supply (B+ and filament) capacitance using low ESR electrolytics with polypropylene bypasses, a zero recovery diode for the bias supply, stainless steel chassis, larger power transformer, closely matched resistors and polypropylene coupling capacitors all of which I think bring out the potential of the original Dynaco circuit. While not a "world beater," I find the results to be remarkably good, even excellent.
I have a Cary SLI-80 Signature, a Parasound Halo A21 and a McIntosh MC275 MkIV, and I think my Stereo 70 does a very good job of keeping up with their sound quality, while taking into account that they are different kinds of amps. Given a fair chance on a level playing field, the original Dynaco circuit can sonically achieve what I think of as "the high end vibe."
Regards,
Peter