Can anyone identify this Dynaco ST-70 PCB?

Hi all!

Can anyone please help me and identify this Dynaco ST-70 pcb mod! I tried to find anything on this particular mod, but have not so far been able to.

https://plus.google.com/photos/113334333955863905796/albums/6145896397579307857?authkey=CLrS3ubpg8iKGg

Thank you all!

Cheers!

MT

Mike,

I think you are looking at the SDS EF86 board that was sold by Triode Electronics.  It resembles this scan of the board, though not precisely.  http://www.quadesl.com/pdf/st70board_ef86.pdf  I have the 6AU6 version.  It breaks the original pentode/triode assembly up from 2 tubes to 3 by using a 12AU7 in the middle as a triode phase splitter with the outside tubes the EF86's as the pentode amplifiers.  The sound from this board is similar to the original.

Tony

Thank you, Tony!  

You are right this is very similar and I guess I was looking for a exact copy no wonder    I had not been able to find it.

Cheers,

MT