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The cathode current is controlled by the Horiz efficiency coil. There is a coil mounted to the board near the Horiz output tube. This coil when your VOM is connected inline to the lead soldered to the chassis near the tube will measure the cathode current.
As for your CRT, Scotty at Hawkeye in Iowa is about your only choice to rebuild your original tube, he does great work. Otherwise wait to see if a tube comed up here in AK, or search ebay, sometimes you will see them from time to time. But all in all you are not out of luck.
Jpdylon gave you a great description of how to test the HO current and there are alot of knowladgable peeps on this site. I learned alot from these guys so far!
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Honey, turn on the tv.. I'm cold!
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