Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Fri Mar 15, 2013 11:06 pm Post subject: Pull a Marquee tube out to test loose tubes? Absurd! |
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Guys
I need to test several picture tubes a month, and pulling a tube out of my test projector just isn't Fun. I took a spare LC lower mounting plate and drilled it to take two flathead allen bolts to attach the plate to the top of the green tube.
The plate lets me secure the tube so it cannot slide off, as it sits on the pivot pin and I can use two allen bolts as if loading a tube into the projector normally.
I also drilled and tapped two more holes for two long allen bolts to tilt the plate forward for leveling at the screen.
All wiring reaches okay except the fourteen pin neckboard umbilical; I made a longer one about sixteen inches.
I just select COLOR, 2 to operate the loose tube as if it were the green tube installed. There is usually no need to operate any of the installed tubes, the tube under test would not converge anyway due to the odd angle.
Since the green VIM video feed is hotter than red or blue, I keep contrast under 35 unless evaluating stig or flare.
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