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If you want to test an electrostatic tube the best way is on a working chassis. The next best way is a Sencore...The CR-70 and CR-7000 support electrostatic tubes (I think the CR-31 does too). B&K testers of the color era don't support electrostatic tubes.
Third place is one of the late 40s testers that support 7JP4s.
Only the working chassis will show you if phosphor light conversion efficiency is good enough for a bright picture....Collectors with working testers have reported VERY POOR Correlation between emissions and image brightness. Which is why I just pull a restored VT-71 chassis whenever I want to check a 7/8JP4...Now I have a TV37 for those tubes too.
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