Bottlehead Forum

Bottlehead Kits => Stereomour II => Topic started by: oguinn on April 30, 2020, 04:13:17 AM

Title: Blueish Glow in 2A3
Post by: oguinn on April 30, 2020, 04:13:17 AM

I have an ElectroHarmonix Gold 2A3 running in the Stereomour II. I noticed last night that there's a slight blue glow around the top on one tube. Is that tube going bad?

Title: Re: Blueish Glow in 2A3
Post by: Paul Birkeland on April 30, 2020, 04:45:44 AM

That's normal and a sign of a strong vacuum.

Title: Re: Blueish Glow in 2A3
Post by: Natural Sound on April 30, 2020, 04:51:16 AM

I have some Sovtek 2A3's that have a blue glow. In my case it isn't an issue. Here is some more information.

https://blog.thetubestore.com/understanding-blue-glow-in-your-amp-tubes/ (https://blog.thetubestore.com/understanding-blue-glow-in-your-amp-tubes/)

Title: Re: Blueish Glow in 2A3
Post by: oguinn on April 30, 2020, 05:13:21 AM

Hell yeah, strong vacuum.

Thanks guys.