Jon Elson wrote:

Jeff Urban wrote:

Why the hell didn't they just go with electrostatic deflection like in
a scope ?

You need quite a lot of voltage to swing the beam. Vertical is
not so tough, but a linear amp to swing maybe 500+ Volts at
horizontal frequency and have high enough bandpass for the horizontal
retrace is ALSO going to burn a good deal of power. The
magnetic sweep system is mostly a switching power supply, and
so gets a good reduction in power dissipation that way.

Jon

Early TVs did use electrostatic deflection, but the beam quality (and
hence the spot size) is far better with magnetic.

Cheers

Phil Hobbs
--
Dr Philip C D Hobbs
Principal Consultant
ElectroOptical Innovations LLC
Optics, Electro-optics, Photonics, Analog Electronics

160 North State Road #203
Briarcliff Manor NY 10510
845-480-2058

hobbs at electrooptical dot net
http://electrooptical.net