Help me identify an amp


My father, who recently passed away, was an avid audiophile and very proud of his stereo. I’ve been taking inventory of his gear, and while most things are easy to identify, I can’t find any distinguishing marks on this power amp. Can anyone help me identify it? The power tubes are 8417s. Thank you!
https://imgur.com/a/A2cJAFq

dungen

+1 variac - to bring up power slowly/safely to see if working, especially for tube type amps.  

@dungen 

I bet it will sound great.  People are still making mods for the ST 70.

let us know.

Tubes for Hifi makes the kit similar to these amps called the VTA ST-70. Also have a ST-120 version. All their stuff are modifications to the original Dynaco gear. I’m sure they could help you source any parts you need to replace and also help diagnose any issues you are having.

Man, this should be in the HI-FI hall of fame.  I would love to hear what it can do after you get it in working order.

8417 are out of production and unavailable. Quicksilver used to offer an EL34 mod for their 8417 monos.