Wardsweb
Well-known member
I took an old Dynaco ST-70 amp and brought it into the modern age of electronics with some upgraded parts, circuit design, layout, chassis and cabinet.
My rebirth of a Dynaco ST-70
- Thread starter Wardsweb
- Start date
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Paul Wooferwitz
Member
I can't claim to have been at Woodstock, but I did build one of those back in that even earlier day. Gorgeous job!
repman
Well-known member
Nice work , you are a true craftsman
I dont know where you find the time for all your projects !
I dont know where you find the time for all your projects !
Hocky
Well-known member
That looks awesome, huge improvement. What do you plan on running with it? My friend uses one of those on his Aerius and I feel like it rolls off the lows very bad and struggles to produce enough power. He has upgraded the tubes, but I don't think that he has changed any of the electronics out yet.
Gorgeous amp! Great job with the restoration.
Bernard
Well-known member
I redid one too, many years ago, upgrading the parts, including a new driver board, but mine looked nothing like that. You did a wonderful job. Where did you put the electrolytic caps (IIRC there is not much space under the chassis)?
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Double D
Guest
Now THAT is outstanding ! you should be really proud of the work that went into it. :bowdown:
Statman
Well-known member
Wow! That's beautiful.
Wardsweb
Well-known member
The original power transformer and power supply filtering were weak. I have changed, replaced, or upgraded to allow for tube swapping and more bottom end. Mine is a better and a more refined amp from the original.
slowGEEZR
Well-known member
Looks really cool. How hard would it be to bridge it and use it as one side of a pair of mono amps? Ha ha, of course, then you'd have to build the twin, but two of those would look and I bet sound awesome.
Jimna
Well-known member
stunning, you really are skilled craftsman.
tonepub
Senior Member
Hey, do you want a pair of Mark III's? I've got a pretty good pair that I need to move out of here. They work fine, but I was going to rebuild them. No time anymore!
Wardsweb
Well-known member
Jeff you have my email, drop me a line and tell me more.
Wardsweb
Well-known member
Thanks guys, I do believe it took a nice amp and has taken it to the next level. If you want to see the details that went into this transformation, follow this link to my build page.
http://wardsweb.org/audio/ST70/
http://wardsweb.org/audio/ST70/
Man, awesome job! :bowdown:
Great attention to detail on this re-design / rebuild, thanks for sharing the build story link.
Dominick22
Well-known member
That is much better looking than the same old plain design they still use. I really like the wood integration.
Dominick
Dominick
User211
Well-known member
Very nice indeed.
Rebuilding old classics - way to go.
Rebuilding old classics - way to go.
wallacefl
Well-known member
The chassis/layout is perfect with the can cap removed/moved and the rectifier tube centered... I wish "tube4hifi" which has a nice updated version of the ST-70 would offer a chassis like this...I would purchase a kit in a second.
