On 8/10/14 2:00 AM, Morris Odell wrote:
I also have a question - among other things the PIR motion detector
switches the power to the CRT heater. Is it worth dribbling a little bit of
current through the heater when it's off so that it heats up faster when
the PIR senses an observer? If so, how much? The CRT heater draws 300 mA at
6.3 volts when it's working but takes about a minute to get to full
emission. Will preheating it like that shorten its life significantly?
Any opinions much appreciated,
Thanks, Morris
Morris,
Most television sets made in the 1970s used a half-wave rectified
version of the 6.3VAC, applied to the heater continuously, for instant
start. I assume that they did enough study of the idea to ensure a
minimum of expensive warranty repairs.
--
David Forbes, Tucson AZ
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