Dynaco ST-70 with a GSI board, Parts diagram and any info PLEASE

Tanner · 15th November 2009, 04:43 PM

I have a poject amp with a GSI board, It uses 4 tubes and I have very little info on this

, Diagrams, parts lists anything would be of great help to me!!!

Thanks in advance

llwhtt · 15th November 2009, 11:03 PM

I have info on both of the GSI mods. The first one used 4 ea 6DJ8s in a cascode differential setup. The second used 12AX7s in a diff, with 6CG7s as drivers. The first has tubes positioned in a square as you look from the top, the second has all four in a line across the board. Let me know. Also Andy Fuchs is still around and is willing to help if he can.

Craig

Tanner · 16th November 2009, 06:28 AM

My tube are in a square formation, Thanks for the help on this project!!!

Original Burnedfingers · 17th November 2009, 10:54 AM

Does this look like your board?

Original Burnedfingers · 17th November 2009, 10:57 AM

picture

Original Burnedfingers · 17th November 2009, 11:07 AM

picture

Tanner · 17th November 2009, 11:31 AM

Very close but mine has the tubes favoring the right end of the board, I think yours has semiconductors in it as well mine does not. Were getting close

llwhtt · 18th November 2009, 12:56 AM

Here is the schematic of the board that 6GB6GA posted, which I received from 6GB6GA.

Craig

llwhtt · 18th November 2009, 01:39 AM

Schematic won't upload for some reason, stuck on "uploading files-please wait". It'll be there as soon as I can figure out what I did or didn't do.

Craig

Original Burnedfingers · 18th November 2009, 10:53 AM

schematic

Found what I have on GSI

15th November 2009, 04:43 PM	#1
Tanner diyAudio Member Join Date: Nov 2009	Dynaco ST-70 with a GSI board, Parts diagram and any info PLEASE I have a poject amp with a GSI board, It uses 4 tubes and I have very little info on this, Diagrams, parts lists anything would be of great help to me!!! Thanks in advance

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15th November 2009, 11:03 PM	#2
llwhtt diyAudio Member Join Date: Jun 2008	I have info on both of the GSI mods. The first one used 4 ea 6DJ8s in a cascode differential setup. The second used 12AX7s in a diff, with 6CG7s as drivers. The first has tubes positioned in a square as you look from the top, the second has all four in a line across the board. Let me know. Also Andy Fuchs is still around and is willing to help if he can. Craig

16th November 2009, 06:28 AM	#3
Tanner diyAudio Member Join Date: Nov 2009	My tube are in a square formation, Thanks for the help on this project!!!

17th November 2009, 10:54 AM	#4
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Does this look like your board?

17th November 2009, 11:31 AM	#7
Tanner diyAudio Member Join Date: Nov 2009	Very close but mine has the tubes favoring the right end of the board, I think yours has semiconductors in it as well mine does not. Were getting close

18th November 2009, 12:56 AM	#8
llwhtt diyAudio Member Join Date: Jun 2008	Here is the schematic of the board that 6GB6GA posted, which I received from 6GB6GA. Craig

18th November 2009, 01:39 AM	#9
llwhtt diyAudio Member Join Date: Jun 2008	Schematic won't upload for some reason, stuck on "uploading files-please wait". It'll be there as soon as I can figure out what I did or didn't do. Craig