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In Reply to: RE: Standby switch...pros and cons? posted by Eli Duttman on August 18, 2016 at 14:10:53
Eli, if the cl-90, cl-120 has yet to have a current draw through it how can it drop any volts? An extra ~200 ohms before the first capacitor will not keep the b+ from ramping up long enough to allow filaments to heat will it? JH
Follow Ups:
The NTC inrush limiting thermistor delays B+ rise for a few seconds. Those few seconds are enough, when an "instant on", SS rectified, bias supply is employed.
The 1st cap. can't charge up very quickly, working through the thermistor's cold resistance. Ohm's Law tells us that the charging current is limited.
Eli D.
I used 2) cl-120 in series after my shottky bridge and I observed b+ bang right on with a dmm. YMMV I suppose. JH
I would have chosen a device with a higher cold resistance and a longer time constant. A CL-140 (50 Ohms cold vs. 10 Ohms for a CL-120) would have been my choice. Also, I've never had any luck using them in series in the location where you have them. IMHO a single CL-140 would do much better for you.
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