Dynaco ST-70 with a GSI board, Parts diagram and any info PLEASE - diyAudio
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Old 15th November 2009, 05:43 PM   #1
Tanner is offline Tanner  United States
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Default 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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Old 16th November 2009, 12:03 AM   #2
llwhtt is offline llwhtt  United States
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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
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Old 16th November 2009, 07:28 AM   #3
Tanner is offline Tanner  United States
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My tube are in a square formation, Thanks for the help on this project!!!
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Old 17th November 2009, 11:54 AM   #4
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Does this look like your board?
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Old 17th November 2009, 11:57 AM   #5
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picture
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File Type: jpg GSI.jpg (352.1 KB, 164 views)
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Old 17th November 2009, 12:07 PM   #6
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File Type: jpg Dynaco stereo 70 6DJ8.jpg (29.0 KB, 138 views)
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Old 17th November 2009, 12:31 PM   #7
Tanner is offline Tanner  United States
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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
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Old 18th November 2009, 01:56 AM   #8
llwhtt is offline llwhtt  United States
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Here is the schematic of the board that 6GB6GA posted, which I received from 6GB6GA.

Craig
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Old 18th November 2009, 02:39 AM   #9
llwhtt is offline llwhtt  United States
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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
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Old 18th November 2009, 11:53 AM   #10
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schematic

Found what I have on GSI
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File Type: jpg GSI 001.jpg (335.3 KB, 104 views)
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