Power supply power transistors heat sink. These transistors blow very easily, several had been replaced and more were blown when I got it. A fan blown directly on this heat sink to keep it cool. The device with the red wires is a thermal shutoff to turn the monitor off if the heat sink gets too hot. These transistors regulate the ±43 volt raw power to the regulated ±22 volt used for CRT deflection. They are controlled by the G8360 regulator card ( 86K) .
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