Quote:
Originally Posted by Argus25
Wow, that one looks massive.
I found a little more information on the 1937 gun version in Fink's television book. The CRT apparently runs 2mA beam current and they mention a figure of 5mA too and 10kV, so it has about 20 to 50 watts screen power. No a wonder the CRT phosphors had a habit of aging relatively quickly. It also has a focus coil wound to prevent spherical aberration. I'm sure a scan collapse on one of those projection CRTs would destroy the phosphor is short order.
|
Some flying spot telecine scanners had air-blast cooling on the CRT face- I wonder if this was ever used on projection sets, or maybe the noise would have been too obtrusive in a viewing/listening environment.