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