If you have a short and can determine the shorted elements there are a couple of possible ways to "maybe" fix the tube.
You can try to see the shorted elements, and carefully "rap" the tube in the opposite direction of the short. This can sometimes bent the internal support rods enough to clear the short.
I DO NOT recommend this on CRT's. Way too dangerous.
I have used a charged electrolytic capacitor of 80-250 MFD charged up to 300-450 volts across the shorted elements. Sometimes it will "blow" the short out of the tube. Last ditch thing to try. DON"T USE ON FILAMENTs! It will disintegrate them.
On CRT's, I had good luck using the capacitor trick to blow out G-K shorts. About a 50% success rate. It saved many customers several hundred dollars on a new CRT.
BTW, This trick worked when the shops fancy schmancy expensive CRT tester/ rejuvenator failed to do the job.
(Of note- This NEVER worked trying to clear gun shorts in Sony and Zenith/Goldstar CRT's.)
Subject: Shorts in Tubes and CRT's 
February 27th 2024, 9:48 pm
