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Re: Dynaco ST-70: upgrading using mod kits or replacing existing parts?

210.254.151.98

Posted by John H on July 24, 2002 at 13:39:12

In Reply to: Dynaco ST-70: upgrading using mod kits or replacing existing parts? posted by newbie on July 24, 2002 at 10:26:20:

I just finished a Dynaco ST70 restoration that took about 6 months. I agree with Jim C's post regarding doing it slow and spreading out the cost over a period of time.

My changes are pretty much as follows:

Replaced selenium rectifier $1
Replaced Bias Filter capacitors $2
Valve Art EL34 Quad $56
Svetlana EL34 Quad $56 (I had a valve art go bad so I bought these)
Replaced Bias Resistors $2
Replaced 7 tube sockets (4 output, 1 rectifier, 2 driver) don't change the sockets on the front to keep the look $25
Sovtek 5AR4 $15

Replaced the quad capacitor with a replacement from Antique Electric Supply $35

Replaced the PC-3 Driver board with a new restoration board from www.dynaco-doctor.com. $45 (Joe's website should be the first step in your restoration. He has some great info for downloading available on the ST70)

Stuffed the restoration board with all new Riken resistors from Angela Instruments $2 each ($75 or $80 or so for all the resistors in the dynaco)

Replaced all driver board capacitors with Auricaps $35

New Input jack replacement part $7

New Output Gold Binding Posts from Radio Shack $16

As you can see the restoration didn't cost much and you certainly don't need to spend near as much money on resistors and capacitors as I did. If you were to replace with Allen Bradley resistors and Orange Drop capacitors you'd spend a fraction of what I did.

Change things slowly so you'll know what changes work for you. Just putting all new stuff in is no guarantee that it'll sound better than the old stuff. If the old stuff sounds better....keep it.

Good Luck on your restoration. Almost everybody has owned one of these at one time or another and the www.deja.com newsgroups are full of posts with every imaginable problem, solution, modifications, and theories regarding the ST70. No matter how bad it gets the answer is out there on the web.

Good Luck.......John

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