[Collins] 872a Lamp, revisited

[Dr. Gerald N. Johnson, electrical engineer]

So long as its AC applied to the plate, a choke works better than a
series resistor. Dissipates much less power. And allows a super start
mechanism for low voltage by shorting the tube then opening the circuit
to let the inductive kick of the choke rise to the necessary initial
firing voltage.

73, Jerry, K0CQ
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Entire content copyright Dr. Gerald N. Johnson, electrical engineer.
Reproduction by permission only.