Dumont RA-110 from ETF

[old_coot88]

Originally Posted by Penthode

I haven't seen anyone ask this. I generally test the transformer in service by removing the 1b3 cap and see if I can draw an arc. I would take a pointed screwdriver and connect one end of a clip lead to the screwdriver and the other end to ground. If I can pull a 1/2" to 1" arc, I am satisfied the flyback transformer is okay.

Wow. Are you serious about connecting it to ground?
The only way i've ever done it or seen it done is to draw an "air arc" with an ungrounded but well insulated screwdriver.
The air arc is just about as long anyway since it's RF. And it doesn't risk overloading the xfmr as a straight-to-ground current path might.