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First of all open it up and and make sure the tube is seated properly, it could be just loose. If the tube is gone you either have to replace just the one, a pair or all the tubes. The replaced tube(s) may then need biasing. It all depends on the amp. I'm sure a quick google search will tell you.
And if you touch the wrong thing inside a tube amp you will kill yourself.
Be warned.
is that a blues junior?
looks like you've lost an EL84!
buy a matched pair and replace both if moose's trick doesn't work...
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