19 Jun
2006
19 Jun
'06
10:08 a.m.
From: "Tony Duell" <ard at p850ug1.demon.co.uk>
Yes, the VCR97 is a 6" electrostaic deflection and focus CRT
A very lucky find! I recently got hold of some "television and
shortwave"
magazines from 1935 to 1939, which cover the late mechanical and early
electronic systems (the Baird 240 / EMI 405 competition and such like. There
is also a lot of information on the development of the Scophony mechanicaly
scanned 405 line receiver (I have one of the few remaining parts of a
Scophony set, http://www.g1jbg.co.uk/tv1.htm)
Jim.
> There were, as Tony says, a number of kits and
self build designs
available
> in the years just before and just after WW2. I
have a design for a Radar
> tube based set on my bench at the moment, as I'm planning to modify it
into
a multi
standard monitor (240, 405, 441, 625) for use with a PC based
Presumably your radar CRT is electrostatically defiected, which makes
varying the scan rate a lot easier than if you were using electromagnetic
deflection. > Going back further, the Baird 30 line mechanical
system became popular
after
> the "Daily Express" newspaper produced
and distributed "televisor"
kits -
somewhere I
have a picture of them loading railway trucks with the kits.
There were also other suppliers of kits and specialist components, like
Nipkow discs, or mirror screws.
I found 'Newnes Televsion Handbook' in a second-hand bookshop a few years
back. I don't think they realised what it was, the price was pretty low.
It covers _only_ mechanically-scanend stuff....