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During part of my CT-100 project, I stood the chassis sideways on a square of heavy plywood. I screwed one end of a diagonal brace (a wooden stick) to the plywood and lashed its top end to the upper part of the chassis. That allowed me to make measurements & adjustments with the underside of the chassis exposed.
Tube extenders let you make many voltage measurements from above, when the chassis is in the cabinet, but if I recall correctly, there were some tubes under the CRT without enough vertical room to take an extender.
I use a second cooler with a folded quilt to make a seat behind the chassis.
Phil Nelson
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