kcrow
Joined: 19 Jul 2007
Posts: 28
Location: Mpls, MN
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| Posted: Sun Jun 08, 2008 9:02 pm Post subject: Question on Marquee VIM |
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Forgive the ignorance, I know all you guys are CRT Zen Masters....
Are the small Red Green Blue cables coming off the VIM board with the mini-rca connectors actually carrying the video signal (image) to the tubes?
Thanks,
Kevin
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Sun Jun 08, 2008 9:41 pm Post subject: |
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Say Kevin
They sure do. The VIM switches and takes in raw RGB, strips sync from green if necessary, adds on-screen text and test patterns when needed, and controls contrast levels, so it is sort of a "video preamp" which feeds the neckboards on the back of each tube. The neckboards are like power amps to the electron guns and supply the signals as + and - 85 volts to the electron guns. Other signals go to the control board and deflection processor board to synchronize H and V sweep to drive the raster in tune with the incoming signals.
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