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It has been my experience that if you can't get the cutoff into the box--get it as far as it will go and measure form there. It is usually pretty accurate.
Keep in mind...this tube tests into the good range at 4 volts on the filamant. and does not drop much at ALL on life test at 6.3 volts.
By that same measure....I have seen a number of tubes that would go into the cutoff box FINE....but did NOT have good emission or dropped quickly on life teat.
Last edited by rca2000; 05-28-2015 at 11:39 PM.
Reason: More info
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