21" RCA B&W from 1955

[dieseljeep]

Originally Posted by Notimetolooz

Why did you chose to use a 270 ohm to simulate the problem?

There is no standard used by the CRT tester brands on how much leakage is too much. They probably use different voltages to measure leakage for instance.

Other than the testers how did you determine that the tube had a problem?

Any leakage could be due to a problem in the tube base and not necessarily internal in the tube. Perhaps the set was caught in the rain at some point and has a deposit left in the socket.
It is a bit difficult to believe that the tube would show good cutoff if it has a K-G1 short.

I noticed that the picture of the inside back of the set shows no ion trap, that tube should have one.

It looks like a newer issue CRT that doesn't use a ion trap!