28 Feb
2012
28 Feb
'12
10:04 p.m.
--- On Tue, 2/28/12, Jecel Assumpcao Jr. <jecel at merlintec.com> wrote:
My father started working at RCA in 1957 and tells me
that
hybrid
receivers (with electronic horizontal circuits and
mechanical vertical)
were still common at that time. I found absolutely nothing
about them
online. Even museums that list their TV receivers seem to
jump directly
from full mechanical models to fully electronic ones.
I think you might have misunderstood something about that. All electronic television was
well and truly common by 1957. In fact, RCA had color sets on the market in 1955.
Even in the late 40's, television was all electronic. Electrostatic deflection,
however, was quite common back then - perhaps that's what he meant. Instead of
magnetic coils to deflect the beam, early small screen sets used electrostatic tubes, with
deflection plates in them. Most oscilloscopes used electrostatic tubes for a long time
thereafter, but as television sets got bigger, they went to all magnetic deflection.
-Ian