Time to get this site upgraded, so we are passing the hat around. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html
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I'm assuming the aluminized screen is much like the early Sony Videoscope and the Advent Videobeam projectors?
The Sony Videoscope screen, Advent screen and the Kodak Ektalite screen have a forward gain of 13! The screen material is the backside of aluminum foil.