This is the amplifier board for the X or Y deflection signals. Two of these board are used. It controlled the power transistors on the heat sink ( 35K) which drove the deflection coils on the CRT.
Feel free to contact me, David Gesswein firstname.lastname@example.org with any questions, comments on the web site, or if you have related equipment, documentation, software etc. you are willing to part with. I am interested in anything PDP-8 related, computers, peripherals used with them, DEC or third party, or documentation.
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