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Advents.... I saw a working 710 a year ago and it was wretched. The 1000A used Schmitt optics tubes, so they put out enough light to be seen on a 7 foot screen, but today's projectors run circles around old Advents. A mint 7 foot 1000a screen would be worth something, as it had the most neutral texture, much better than the brown bordered washables. Even the Novabeams don't compare. In the old days lenses and crt blooming limited what the picture looked like, so the chassis have poor video frequency response. Today, guns and lenses are much better. Any HD set puts these to shame.
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