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[Anonymous]

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[MrMarkIII]

Is the un-glowing tube still hot to the touch?
Then it's probably still working. Some tubes just "glow" more than others. Try checking for "glow" in a dark room.
In "Class A", the inner pair are out of the circuit.
Try putting the 6L6s in the outer sockets and running just them in "Class A". It won't hurt the amp, the owner's manual says you can do this at a gig in case of tube failure. Or switch them around in their inner sockets to see/hear/feel if there's a change.
There are three other sockets on your amp in which to test this "un-glowing" tube.

 

[Anonymous]

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[MrMarkIII]

RTM... And stop eating that stuff.
The inner socket tubes "glow" in "Class A" just like they "glow" when in standby. Sort of.
First, switch the two 6L6s. If the cold, dead tube remains so in the other socket, mark it "BAD" so you know which tube to toss when you remove both and they are lying there on the workbench looking identical.
Second, keep the good tube to start your collection of spares, toss the bad. If you're feeling green, remember that tubes are toxic electronic waste, and dispose of accordingly.
Third, get another matched pair of 6L6s that will work in a Boogie.
Fourthly, install, fire it up (use the standby switch), and enjoy!
If the fuse didn't blow, it's unlikely something seriously bad happened. But it's a good idea to make sure the fuse is the correct type for a Mark III - 3 amp slow-blo. Available at Radio Shack.
And stop eating that stuff.

 

[stokes]

As long as you use the amp in Class A,only the heater or filament is active in the inner pair,obviously the filament in your bad tube is dead,you wont hurt the amp.If you try to use it full power,with all four power tubes "active" your current will rise drastically in the single tube that is still working along with the dead tube,that is not good,dont do it.If it still sounds bad with only the outer tubes working,as in class A you have a problem unrelated to the bad tube on the inner socket.I would guess the outer tubes are on their way out as well.When you use class A you lift the cathodes of the inner tubes,taking them out of the circuit so they have no effect at all.

 

[Anonymous]

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