Hot tubes/

[paddy ryan]

Hi, Question; is an 6BR7 tube supposed to get hot? I detect a very small glow, but the tube stays just warm?

 

[danadak]

Yes, what T do you measure of the envelope ? See typicals in the following datasheet :

https://tube-data.com/sheets/184/6/6BR7.pdf

Regards, Dana.

 

[paddy ryan]

Sorry, 'T; ?

 

[Nigel Goodwin]

Sorry, 'T; ?

I would assume temperature?.

However, what voltage are you feeding to the heater?, it's a standard 6.3V heater.

It's only a small signal valve, they don't get terribly hot, if you can see the heater glowing it's probably hot enough.

Going back decades to when I repaired valve gear on a daily basis, you could easily change running small signal valves with your bare hands, where as power valves often needed a duster round your fingers.

 

[paddy ryan]

Thanks folks, thats great.