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Amp not working

well, I bought my amp today, Marshall MB rig (head+410 cab)
As soon as I got home I pluged in and played away on both channels (SS and Tube), about an hour later I went back to play it again and the Tube channel was really quiet I have to crank the master volume to get any sound, but the solid state channel is fine.

Any Explanation?
 
well, I bought my amp today, Marshall MB rig (head+410 cab)
As soon as I got home I pluged in and played away on both channels (SS and Tube), about an hour later I went back to play it again and the Tube channel was really quiet I have to crank the master volume to get any sound, but the solid state channel is fine.

Any Explanation?

Could be a bad tube - take the thing back to the store and get another.

Paul