Refurbish a Dynaco St70

Do not waste your time, and your money on a re build. It would not be cost effective. Even if you have the original circuit diagram, and original parts list, I doubt you could find current components that will work. Move on to other tube products, mostly from China that are a good value. Check out the Cayin line, great sound, great value. Better yet look for a Sound Values, M60 tube amplifier. The come up on ebay often. I have a pair and they sound great. They were a knock off of the St60, from the firm that brought up all the parts inventory of Dynaco went out of business.

Talk to these guys

http://enjoythemusic.com/magazine/manufacture/0902/index.html

I meant look at this. There are a number of places the redo these, although it may be cheaper to buy a renovated model used.

Thanks for the responses. I will check into enjoythemusic. I have considered that the cost might not be worth it on a strictly sonic basis. Such an historic amp and in such great shape thought it worth checking into. If is decide not to do anything with it I hope to find someone interested.

To rebuild a Dyna ST-70 is not that nuts! We do it all the time. The filter caps are readily available as the amp is so popular and the tubes are easy to find too, although the 7199s have been going up in price recently.

A properly-working ST-70 is actually a respectable amplifier. They have distortion figures that gave their competition conniptions back in the day (Hafler was an excellent designer) and so rival much more revered amps like the Marantz 7B.

There is an excellent thread about the ST-70 on audiokarma: [ur]http://www.audiokarma.org/forums/showthread.php?t=578485[/url]