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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
kr4's avatar
kr4
3,683 posts
 

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.

ghdprentice
6,983 posts
 

Wow. Now that is one old amplifier. 

dungen OP
4 posts
 

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. 

kr4's avatar
kr4
3,683 posts
 

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.

dungen OP
4 posts
 

While I’m at it, I may as well ask my next question: what is it gonna need to get up and running again? It certainly hasn’t been used since 2012, probably even longer.  I know electrolytics fail with time. Given the usefulness (not to mention sentimental value!) of the gear, I will definitely want to take it to an amp tech for restoration. What should I anticipate needing to do?

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