7" electrostatic question

[NoPegs]

Originally Posted by John Marinello

And you base this on what?

Based on how my Accurate Instrument Co. Model 257 works if you want to "test" a CRT...


Here's the relevant manual pages for your perusal. (Linked due to size.)


http://www.funkengine.net/vk-img/2015-01-28/CRT-1.png
http://www.funkengine.net/vk-img/2015-01-28/CRT-2.png


Providing you know which pin is which position on the selector switches, and what pin of the tube you've connected it to, you should be able to at least go/no-go a tube in the field...

Armed with the data charts for my EICO-666, and a homebrew adapter, I think I could possibly come up with something that goes a bit further than toast or not-toast. The EICO-666 can actually come close to the appropriate voltages required for a real test of a CRT, the Accurate Instruments Co. 257, not so much. (That's why it says use the "DIODES OK" scale.)