Is there a reason why my eye tube glows so dimly but tests good? I have a lot of radios like this.

Thanks

:Is there a reason why my eye tube glows so dimly but tests good? I have a lot of radios like this.
:
:Thanks

The phosphor on eye tubes degrades significantly with use / age, and just sitting at over room temperature. Some brands and date codes are worse than others.

Ed M

http://www.dialcover.com/eyetube.html

Radiodoc
***************

::Is there a reason why my eye tube glows so dimly but tests good? I have a lot of radios like this.
::
::Thanks
:
:The phosphor on eye tubes degrades significantly with use / age, and just sitting at over room temperature. Some brands and date codes are worse than others.
:
:Ed M

:http://www.dialcover.com/eyetube.html
:
:Radiodoc
:***************
:
:
:::Is there a reason why my eye tube glows so dimly but tests good? I have a lot of radios like this.
:::
:::Thanks
::
::The phosphor on eye tubes degrades significantly with use / age, and just sitting at over room temperature. Some brands and date codes are worse than others.
::
::Ed M

The tester only tests the triode, has no way to know what condition the phospor is in.
Lewis