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Help me ID this ST70 mod

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Posted on March 15, 2016 at 12:56:17
Idler
Audiophile

Posts: 13
Joined: August 5, 2000



Can someone help ID the input board in the attached photo? Possibly a CAE PWB-3A CCDA Driver Board?

Thanks
Idler

 

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RE: Help me ID this ST70 mod, posted on March 15, 2016 at 21:39:29
xaudiomanx
Audiophile

Posts: 2947
Joined: August 16, 2004
Many tube mods for the Dynaco were done using three input tubes to replace the 7199 tube. The CAE mod always used standoffs on the input board attaching it to the chassis. I really don't know all the boards out there but the CAE from my past knowledge used standoffs. If it has them it could be a Curcio. I also think Triode Electronics used them as well now thinking about it but I think Triode Electronics has it's name on the bottom of the board.

What tubes does it use on the board?

 

RE: Help me ID this ST70 mod, posted on March 15, 2016 at 21:42:23
xaudiomanx
Audiophile

Posts: 2947
Joined: August 16, 2004
Looking at it again I now see 4 tubes. That might be a Sutherland or an early Audio Research board. Audio Research did a board of their own before marketing their own amps.

 

RE: Help me ID this ST70 mod, posted on March 16, 2016 at 19:36:06
Idler
Audiophile

Posts: 13
Joined: August 5, 2000
The tubes are 6922's. It looks, on further consideration, like Curcio's Cascode Differential Amplifier Driver Amplifier w/ Active Current Source, which is a 4 tube driver board.

The Audio Research mod, according to ARCDB, has 6 to 7 tubes on the driver board.

Thanks for the response.

Idler

 

RE: Help me ID this ST70 mod, posted on April 18, 2016 at 03:58:14
zacster
Audiophile

Posts: 1099
Location: NYC
Joined: November 22, 2003
If it is, it doesn't have the same arrangement of caps as mine does.

A bigger, clearer picture would help.

 

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