28 Feb
2012
28 Feb
'12
10:26 p.m.
On 2012 Feb 28, at 10:04 PM, Mr Ian Primus wrote:
--- On Tue, 2/28/12, Jecel Assumpcao Jr. <jecel at
merlintec.com> wrote:
I don't have examples, but to give him the benefit of the doubt,
perhaps he was referring to special cases such as projection TVs or
some-or-other studio equipment. Working in RCA he might have been
seeing stuff most people wouldn't.
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.