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 ( 45K) .
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Feel free to contact me, David Gesswein djg@pdp8online.com 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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