Cause for concern -- scorch mark in tube

dsavitsk · 16th April 2007, 10:54 PM

I have a 5842 that has what looks like a scorch mark in the silver on the top. It still works fine, and I have no idea how long it has been there. I attached a pic, but it turns out that taking a picture of a silver thing is hard, so it actually looks worse in real life. I am running it way under its limits. Do I need to worry about this at all?

sorenj07 · 16th April 2007, 10:55 PM

it should be fine. it's probably where a tiny bit of loose gas reacted with and bound to the getter. it's just doing its job

SY · 16th April 2007, 11:03 PM

I have quite a few tubes that look like that, new out of the box. They're all fine- I suspect that it has to do with the specific gettering process used in manufacture.

arnoldc · 17th April 2007, 04:23 AM

Both my Amperex and Raytheon 5842 looks like that, while my WE 417A does not.

16th April 2007, 11:03 PM	#3
SY diyAudio Moderator Join Date: Oct 2002 Location: Austin, TX Blog Entries: 1	I have quite a few tubes that look like that, new out of the box. They're all fine- I suspect that it has to do with the specific gettering process used in manufacture. __________________ “Listening to records is like ****ing a picture of Brigitte Bardot.” - Sergiu Celibidache

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16th April 2007, 10:55 PM	#2
sorenj07 diyAudio Member Join Date: May 2006	it should be fine. it's probably where a tiny bit of loose gas reacted with and bound to the getter. it's just doing its job

17th April 2007, 04:23 AM	#4
arnoldc diyAudio Member Join Date: Apr 2003 Location: Makati	Both my Amperex and Raytheon 5842 looks like that, while my WE 417A does not.

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