ID this Dynaco ST-70 board

[hollbrow]

Unidentified Dyna ST-70 board. Anyone have any idea which company's board this could be?
I got it in a 'grab box' of ST-70 parts.

 

[vanofmonks]

Maybe triode electronics? Looks like there is the initials np on the board and they had a guy name Ned doing the circuit design I think.

 

[hollbrow]

Hello, thanks for taking a look. Could be. The NP marking is actually ' inside' the layers of board material itself- not silkscreened on. Its a nice board- substantial tracks, plated through holes, soldered well. I'm considering trying it out in a build and would like to know, if possible 'what it is'.

 

[wrenchone]

Yeah, NP is the maker of the board laminate material. I see it on boards we have done at work. I'm looking at one as I write this, and I assure you, it has never been near Triode Electronics...

 

[llwhtt]

I don't know who made it but it's just a STOCK replacement ST-70 board. Now go to Triode, Tubes4hifi, or Dynakit to see if they make stock replacement boards. Ned Carlson was the guy at Triode but I don't think he did stock boards.

Craig

 

[jgf]

Is it set up for 7199 or 6GH8?

 

[stokessd]

Ned used to be at Triode, but he's been gone for nearly a decade now. He had a three tube board that was designed by a guy who I believe died about 15 years ago. After the fire at Triode, the board and artwork were lost and I supplied the new boards for them. Before ned got back on his feet I asked if I could re-layout his board for my own use. After that he bought them from me. I didn't design it, but rather just re-created the original design.

I don't believe Triode ever had a two tube driver board, but they might now.

Sheldon

 

[hollbrow]

I've had it 5 years, and the guy I got from had it a while as well. I dont see anything at triode or the other big dynaco sites that looks like this. I'm aware it's just a copy of the stock dynaco- I was just hoping someone could say "yeah, that is so & so's board from around 1990" or something similar. Thanks for looking.

It came with a couple of tubes the guy said are 7199's- but they have NO markings on them at all- been rubbed off I suppose. I have wondered how to tell if they are even 7199's.

 

[petertub]

I've had it 5 years, and the guy I got from had it a while as well. I dont see anything at triode or the other big dynaco sites that looks like this. I'm aware it's just a copy of the stock dynaco- I was just hoping someone could say "yeah, that is so & so's board from around 1990" or something similar. Thanks for looking.

It came with a couple of tubes the guy said are 7199's- but they have NO markings on them at all- been rubbed off I suppose. I have wondered how to tell if they are even 7199's.

Follow the pins ! 7199 has a unique pin-out, so by examining the socket connections and comarig with the schamatics will tell which tubes that fits.

 

[Ketje]

Follow the pins ! 7199 has a unique pin-out, so by examining the socket connections and comarig with the schamatics will tell which tubes that fits.

You are right it is the 7199
Here is the schematic, as far as I can make of it from the photos .
Mona

 

[hollbrow]

Thanks a bunch for the schematic. A populated, but never installed Curcio quad cap board was also included in the box of parts. I think I will try to build an old chassis I have and use this driver board and the quad cap. I was going to go with a VTA board, but lately, have been considering building what I already have first.

 

[rmyauck]

In North America 3 stock original (circuit & tube) PCB's may be only sold by dynakitparts (which a few years ago changed to the original color) , classicvalvedesign, and Triode as mentioned. There are others on Ebay from the far East also.