I picked up this "Dynaco Mystery Amp" from a fellow AK'er recently and found the boards are VanAlsine PC-489, and the outputs are Hitachi 2SK134 and 2SJ49 MOSFET's, but can't seem to find out anything more about it, like a model # or specs. Apparently it's about 55 WPC or so, based on the output devices. I just wish I had a model # or something to verify. It's in a Dynaco ST-150 cabinet, I believe. Any info would be appreciated.