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Sounds like

75.168.108.86

In Reply to: RE: M60 mk3 tube flash then turns purple for a bit posted by akino on January 21, 2025 at 11:03:18

a bit of the cathode coating flaked off and shorted to the grid for a short bit of time. That would have caused the tube to conduct very hard so you'd have seen a blue glow just on the inside of the glass.

But something happened- either the flake fell away to the bottom of the tube or a link to the cathode of the tube failed due to the current. You can check the latter visually; see the link below.
http://www.atma-sphere.com/en/resources-tubes-inspection.htm (Open in New Window)

Follow Ups:

RE: Sounds like - akino 12:37:43 01/21/25 (1)
Thanks Ralph! I have the 6n13pj. if I move the tube to a different socket, the tube glow follows it, so I'll just replace it...-posting a pic..
- that's a bad tube! - Ralph 13:06:51 01/21/25 (0)
  If you check the links in the bottom you'll see they are blown.
  - http://www.atma-sphere.com/en/resources-tubes-inspection.htm (Open in New Window)

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