CTC16 Flyback Cooling

[Findm-Keepm]

Originally Posted by old_coot88

On a side note, when using a milliameter in the cathode leg (an analog meter that is), it's not necessary to put a cap across the meter, contrary to popular belief.

Odd, because RCA, Jack Darr, and Carl Babcoke all call for a .22uF (RCA) or .47uF (Darr and Babcoke) capacitor in parallel to the meter.

http://www.americanradiohistory.com/...-Page-0084.pdf

What is your rationale? I know theirs - to prevent the inductive load of the meter from becoming resonant - hence, they shunt it with a bypass cap to ground, effectively eliminating the possibility. My Save the Flyback tester has a .47uf/600V across the meter

Your #39 lamp tester was in a May, 1970 Radio Electronics article - they show how to build an efficiency tester, using the #39 bulb. My EBY tester used a #44, and was able to forgo the odd lamp.