14 Jun
2006
14 Jun
'06
6:09 p.m.
What did they
use for a CRT? I have a 3" one in storage that as I recall
wants something like 1000V for an accelerating potential, and a transformer
to develop that isn't exactly trivial.
Well now days you could use a voltage multiplier. Did they every have a DIY for B&W TV like they
had for radios the begining years of development?
Oh yes. I don't know how far back you want to go, but there were
certainly mechancially-scanned TV kits.
After the war in the UK, there were several designs using ex-radar CRTs.
OK, you got a green-and-black picture, but it was a lot cheaper to use
govenrment suprlus than new componets (and those EF50s from the radar
sets came in handy too ;-)). I can't eememember if the 'Viewmaster' was
on such, or if that used a CRT designed for televison, but it was
certainly a home-built TV. Practical Televison magazine (later to become
simply 'Television') publisehed a number of homebrew TV designs over the
years, including at least one colour set.
-tony