But if the step-start also controls the filament voltage it should be
longer than 100 ms. I have always adjusted mine to be about 1s in order
to give the filament time to heat up. I have no idea what the 'correct'
delay would be, but the 3-500Zs seem to be glowing after about a second.
73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
http://www.qsl.net/k2vco/
On 27 Apr 2017 11:33, Ian White wrote:
It also needs pointing out that the large majority of step-starts are
way too long. Modeling with typical values shows that the surge into the
electrolytic capacitors only lasts about 5 mains cycles (about 100
milliseconds) and then you're ready to step up to full mains voltage.
There is no advantage in stretching out this period any longer. Some
people seem to imagine that a step-start period of several seconds is
"more kind to the components" - but in fact it is the exact opposite.
All it does is stretch out the overload time for the step-start
resistor, and increase the risk of it failing.
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