[Heatercathodeshort]

The Philips 22CS1002 employed one of the early short life 30AX tubes. I well remember having 3 year old versions arriving on the workbench with completely flat tubes. Many of these were flat during the guarantee period but customers just became used to the poor picture quality requesting a service call when something more noticeable became apparent.
Mullard did replace a number of these low emission tubes well outside the guarantee period but you had to speak to the guys at New Road 'nicely' !
This very short life was quite a surprise due to the longevity of the previous 20AX series that were fitted with an almost identical gun assembly. [These were usually destroyed in the Philips G11 smoothing cap saga rather than failing due to an unreasonably short service life.]
Something must have gone wrong in production, maybe an impurity or an unsuccessful change in manufacturing procedures. There is a lot of magic in CRT production.
Typical of Philips/Mullard the problem was recognized and soon rectified producing the later 30AX tubes that very rarely failed even after years of service. They probably produced the best quality picture ever with their 7.5kv focus potential, fat monitor crt type neck and pin sharp colour.
You may find a scrap receiver with a good tube. They can be replaced in about ten minutes, no convergence adjustment needed with just a tweak to the drives and grey scale. hope you get it sorted. The K30 is a cracking example of Philips technology. Regards, John.