Um did you try google? I just googled Dynaco Stereo 80 and a ton of stuff came up. Give it a try.
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I previously owned one of these amplifiers...
As you mentioned, it was a rare bird. Most people confuse it with a solid state product Dynaco produced of the same name. The Stereo 80 addressed the well-known complaints of the venerable Stereo 70: a bigger power supply and a "proper" driver (Mullard long tail pair vs. traditional Dynaco Concertina) stage. There were also a couple of niceties such as the triode/UL switch and bias LEDs.