ctc-16 part number

[bgk283]

Fixed the problem after replacing the thermistor and varistor. The short was caused by the vertical output transformer. This is the third ctc-16 in 3 years that has had this issue, now my question is, if they last 50 years or thereabouts, I guess I wont have a problem with them. Assuming its a heat issue, how important is the shield around the transformer that also encases the 6BK4? Can I safely run it without that thing? or is there an electron bombardment that necessitates the shield, thanks ,just looking for some input. Bruce