Refurbish a Dynaco St70


This is my 2nd attempt at getting this thread started. 1st attempt never posted. Please forgive should a duplicate arise.

I have a Dynaco ST-70 that has been in storage for several years and has few hours on it. I would like to have it refurbished and updated for electrical components, inputs, and outputs. After having searched this forum I thought it might serve me best to initiate a new thread. Looking for contacts for having this done. Thanks in advance for your suggestions. Mike
mesch

Showing 14 responses by mesch

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.
Thanks much! The responses are exactly in the form I was hoping for.

Atmosphere, am I correct in thinking that you (your company) rebuilds them for others that supply the amp?
Thanks much Atmosphere! I will contact you regarding having your people do this. I believe it would be fun to play with and should I not find a place for it in a system and am sure I can find a AG member to enjoy it without much $$ loss.
Thank you Kirkus for such a complete response. I am going to contact Ralph regarding getting this done and go with his suggestions.

The 1st system I heard that got me into this hobby was: AR XA turntable, Dynaco PAS 3 & ST-70, AR3a speakers. Couldn’t believe the sound. It was spring of 1969, I was 19.
Swamp, yes I was and consider myself that way over my life. Hope to continue in same for some time. Took me some time after hearing that system to get to tubes, 2010 actually, now use a tube pre into SS amp. You don’t happen to live in south Florida, 'a walkin the swamps’, :-).
Swamp, actually I am from southern Illinois. We do have a cyprus swamp, one of the furthest north in US. Seems you have been walkin' through allot of snow given the many major snow storms in the last couple years.

Anyway, back to the post, I currently have an working AR XA turntable. Cartridge on it need replacing. Given that I have a start on a vintage 60s system, I might pursue it further.
Schubert, i believe you are correct. I live ~60 miles north of Cario so more of a toss up.

Swamp, field work, report writing, Cancun & margaritas; been there and done that! Cheers.
As an update I have contacted Ralph (Atmosphere) and intend to ship him the amp for refurbishment. When I have this done and try out the amp I will provide my thoughts. Thanks to all!
Wow Papa, what a great deal! My ST-70 came to me free as it was going to be thrown out. Have not yet sent it to Ralph however the intent remains.
As an update, I was distracted from this however finally got around to boxing my ST-70 to be sent to Ralph. It will go out this week. I will keep all informed as this project progresses. May try to find a PAS-3 thereafter. Oregonpapa, maybe I need to go garage sale shopping. 



OK, so I have received my ST-70 from Atmosphere, purchased new tubes as recommended by Ralph, biased the tubes, and hooked to a set of Clestion F15 speakers for a trial run. Amp works perfectly and sounds wonderful. Ralph was a treat to work with, had several conversations around his recommendations as what to do and pretty much followed his recommendation to a 'T'. Ended up keeping the amp as original as possible.  I am very pleased with my choice to refurbish. Thanks Ralph! Thanks to all for their input toward this end!  As I indicated on another thread, I am still looking for speakers that mate well with this amp.