Discoloration on Tube Flashing

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Tyson

Discoloration on Tube Flashing
« on: 15 Feb 2019, 02:33 am »
Noticed this just appeared on one of my tubes, a dark discoloration on the shiny silver flashing at the top.  Is this cause to be concerned?




sfox7076

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Re: Discoloration on Tube Flashing
« Reply #1 on: 15 Feb 2019, 07:48 pm »
It would be odd if burning like that was a sign of anything other than use.  Usually if it is more, the getter turns white.  Regardless, that looks like a pattern seen on many of the Mullard EL34s I have owned.  They all look a bit off, but my XF2s have lasted years looking like that.

Tyson

Re: Discoloration on Tube Flashing
« Reply #2 on: 15 Feb 2019, 07:49 pm »
Thanks - I nosed around a bit on the internet and that seems to be the consensus, it's just a sign of use. 

FullRangeMan

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Re: Discoloration on Tube Flashing
« Reply #3 on: 15 Feb 2019, 07:52 pm »
I have various Ulianov new that have this rainbow and they are normal, GSTubes inform me this is normal and originated from the getter apply, if it is what I think it is, as I cant see anything in this photo.