Quick update - After reading about one channel going out on the amp I started to wonder if it was going bad when I listened to it a few months ago. The last 'touree' sent it back to me and it sounds great in my system. I haven't cranked it yet and don't plan to but it is now loud enough using my Mini Stratas that I could happily live with it as my main amp.
Shadowlight very generously donated it to me - THANKS! - and I am now seriously considering buying an Astron PS to see how much better this amp can sound. Can anyone point me to a specific model(s) that would work? I will start hunting e-bay or other sources when I know what to look for.
I'm still not totally sure how I would connect the amp to the PS, but if it is not too technical I'm pretty sure I could get it working. My tech skills are limited - I soldered a replacement GR tweeter to my Minis, but I'm willing to try the Astron. Thanks to rhing and Shadowlight for their contributions. The whole experience has been fun and I've learned some new things.