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a colleague at work who plays with vintage TVs may be able to lend me a CRT tester. I better check it can test these Triodes, I gather that not all testers can.
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You are correct, most CRT testers cannot be used on a CRM92. I use either my Avo or Taylor valve testers to check these types.
A simple lead was made up from an octal valve base to connect to the tester to crocodile clips to the CRT pins, the results are quite accurate on the tubes I have tested so far.
If I remember correctly, an external PSU was used to supply the CRT heater.
It should draw 1.4 amps @2v.
Mark