Do I need to replace the tube?

[Listogast]

I jammed with a friend the other day and while taking my stuff back to the car I must have knocked the half power switch on my DSL40C to an in-between state which meant that I had no sound. At first I thought it was the tubes and noticed one of the power tubes was not glowing. But then I saw the switch and flipped it back to full power and the amp works just like normal. But seeing that tube not glowing makes me wonder if I need to replace it. I don't notice anything wrong with sound or volume or anything like that.

 

[Pete Farrington]

I don't notice anything wrong with sound or volume or anything like that.

I don’t think you need to be concerned about the valves then.

 

[TheKman76]

Also, the power/standby switch has nothing to do with the heater supply.
So, a valve not glowing is a separate problem. Is it still not lighting up?

 

[Resident 217]

If you turn it on and it IS lit, test it loud...something ,may be loose.