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In Reply to: RE: VR tube as bleeder in choke input supply? posted by vbenonisen on March 24, 2017 at 17:01:13
No matter where you put the vr tube, after the first L in the LCLC filter, it will have a cap across it.
I believe .1uf is max for a vr tube.
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"Still Working the Problem"
Do you really have to have a cap across it? If you use the necessary dropping resistor to the VR tube then the following C shouldn't be connected directly to the VR tube at all. If I'm thinking straight. The tube isn't regulating anything. It just burns current and looks nice.
It also generates noise. The snubber in parallel is necessary and the 0.1 μF. max. mentioned previously can, sometimes, put you into relaxation oscillator territory. :> ((
Just put 1 Kohm of resistance (appropriate power handling capability) per H. of I/P choke inductance in parallel with the 1st capacitor. Remember, the approx. critical current (in mA.) is given by V/L. Larger inductance = smaller critical current.
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