05/11/2026
I am looking for any information that I can find for this pair of Gray Research mono preamp. The model number i believe is AM3. I have the power supply, but I need a schematic to restore. This pair has been highly modified, and I would like to restore them. They also made a matching power amplifier that went along with them, but that amplifier was fashioned after the Dynaco Mark III. As always, thanks for the help