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OK, I finally got the adapter to test my 21EAP4 with my B&K 465 CRT tester and here are the results: I set it up assuming a 2.34v filament.
No shorts
Emissions = 700/9.2 (not sure which scale I was supposed to be looking at)
Cutoff = 30 ( setup chart says 28 to 72)
Life test: meter went slowly down from 700 to 0 in about 7 seconds. With no experience, what does this tell me? It did hesitate briefly before decaying. Is that a good lifespan left?
The only thing I was not able to do right now was the current test to verify if it is drawing 600 mA at 2.35v as my handheld meter was only rated to 200mA. I have the adapter partially rewired as suggested above, awaiting an order of alligator clips. I there another technique for checking the current?
So based on that, does it look like I have a good tube? Thanks
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Rick Fray
Cibolo, TX
Novice vacuum tube fan
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