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

The chassis, layout, transformers are from a Dyna ST70 but one that has been significantly modified in many way.  I suggest a search for Dyna mods with 8417s to see if you can find a match.

Fantastic, thanks to everyone for helping! He often mentioned Dyna to me (we were also both interested in Sunn bass amps, which are based on a Dynakit design). Is the ST70 something that was sold as a kit? He may have assembled this himself if so. I will try to open up the chassis later and see if the PCB has any marks on it. 

The ST70 was sold as a kit and also fully assembled.  The tape labels suggest DIY.

The PCB is not a Dyna but may offer a clue.