24 Oct
2008
24 Oct
'08
1:24 p.m.
On Thu, 23 Oct 2008, Tony Duell wrote:
I just want to mention that there were polar-coordinate tubes. They may be
Interesting,. I'd not heard of those before. I will have to try to find
some data sheets, etc.
I don't recall them being mentioned in the ook 'CRT Displays' (part of
the Radiation Lab series), but I may well have missed them.
Well...one without deflection plates is rather difficult to use as a
vector display, but that's a matter of complicated and unconventional
One without _any_ deflection system is hard to use as either a vector or
raster display :-) Tektronix --
use large-screen electrostatic CRTs. But the DEC VR14 and
the Vectrex video game both use electromagnet CRTs.
The DEC VR14/VR17 are electromagnetic CRTs. The two push-pull power amplifiers for both ordinates as well as the current
through the
deflection coils are quite impressive.
YEs, there's a heatsink with 4 large power trnasitors under the flip-chip
backplane IIRC.
-tony