Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Miracle1980 on November 07, 2020, 09:48:56 am

Title: Tiny blue tone in a valve. Picture inside
Post by: Miracle1980 on November 07, 2020, 09:48:56 am

Hello, today I have noticed a tiny blue tone in one of my EL34 valves.

I have attached a picture. Everything is fine or should I start worry about?

The valve is not microphonic (tried with a pencil) and everything is working fine...

Thanks

Title: Re: Tiny blue tone in a valve. Picture inside
Post by: Latole on November 07, 2020, 02:46:59 pm

It is some gas into the glass, nothing to worry about .

Google

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

 https://www.thetubestore.com/blue-glow

Title: Re: Tiny blue tone in a valve. Picture inside
Post by: AmberB on November 07, 2020, 08:32:41 pm

The blue glow is normal in some tubes.

Title: Re: Tiny blue tone in a valve. Picture inside
Post by: 1blueheron on November 08, 2020, 05:19:12 am

Is it a blues amp?  Might be it's soul coming out... :l2: