Where's The Doorknob Capacitor?
I had always thought that a 500 mmf doorknob capacitor was required to filter the high voltage when using a metal CRT. The inner and outer aquadag coatings with the glass envelope in between serves as a filter capacitor for all-glass CRTs.
I noticed that the doorknob capacitor is not used on color sets with 21AXP22 (metal) CRTs like the RCA CTC-5. How come? |
Quote:
It probably also was good for all glass retrofits/production changes anticipated. |
Thanks, Tom. I have never seen a 21AX set in the flesh. I might have picked up on the insulator cone capacitor. It certainly would have been as good a the aquadag coating on a glass tube. I knew you had to have some sort of filter capacitor, even at 15 KHz.
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