Tube Question

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Escott1377

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Tube Question
« on: 1 Sep 2020, 10:29 am »
I lost 1 of my Clifte 12AU7’s last  night.  It served me well after 3 years of use and about that same amount of time in storage bc of little kids.

I think I remember this correctly, but when the top of the tube turns smokey white, air has entered the tube??

The glass actually split when I pulled the tube from my pre:)

sunnydaze

Re: Tube Question
« Reply #1 on: 1 Sep 2020, 11:17 am »

I think I remember this correctly, but when the top of the tube turns smokey white, air has entered the tube??


Correct.

Happened to a couple of my nice 12ax7 after I dropped them on a hard floor.  Turned white as soon as I powered up the gear.  Broken seal.

https://www.audiocircle.com/index.php?topic=165294.msg1756785#msg1756785