Purpose of white LED lights inside Wolcott amp.


I have a Wolcott P-120S amp.
While rolling some input tubes I have discovered two white LED lights just inside the tube cage at the front of the amp (left & right channel).
One is now on the other is not.
What is the purpose of these lights,
are they indicator or cosmetic lights?
There is no info in the manual.
Many thanks,
GJI
128x128gji
You use them to bias the amp. If the lights are on, that means the bias is set too high. There should be something you can turn with a small flathead screwdriver near each of the lights. Turn the screws counter clockwise slowly until the light goes out. You want to be right at the point where the light goes out, and no further. You should really do this right away, because if the bias is set too high, you may damage the tubes.
I would recommend using a plastic screw driver as there might be voltages nearby and the metal may also induce a error in the adjustment as well.
Gentlemen,
Thank you for you input.
The lamp came on after I changed the input tubes on that side.
The Wolcott P-120S is a self biasing amp,
so tube bias is something I would not think comes into play.
Also, I do not see an adjustment screw by these lights, only a mounting bar.
What Wocott model do you have?