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Hi, This is very likely to be a dirty key contact.
If the loud key is not touch sensitive or by turning the touch off, if all the keys are the same volume then this points to a dirty key contact.
All the best, Chris the Fader.
It sounds like you have a dirty pot (the volume control). Unfortunately the only way to clean the pot is to open the amp up and try to spray some Servisol Super 10 in through the small opening in the pot case.
WARNING: Tube amps contain lethal voltages even when unplugged! If you are not an experienced service engineer then take it to someone who is! It is a pretty common task in guitar amps so shouldn't cost too much.
Press the "click" button and then set the tempo you want, press the "click" button again this will stop the metronimoe but is also sets the tempo in memory. The next time you press the "click" button it will be ready to go.
Anytime you press the tempo + or - it thinks you are trying to use the "Tap Tempo Function".
It is likely that the amp is flat topped at the 7 setting. When the amp is producing the maximum voltage output it is capable of, that is ALL you can get out of it... The numbers on the dial mean NOTHING and are only relative. If you have high output guitars you might find the maximum might only be 3 on the dial for example...
If you need it louder, get a bigger amp and speakers. You should ALSO get a sound meter and follow OSHA guidelines for sound exposure... I know several musicians that now are nearly deaf because of being exposed to high sound levels... their music careers are now gone as they can no longer hear well enough. You need to protect your hearing for the long term. Great musicians don't need loud, but quality and inovation in their music.
I suspect a bypass capacitor for the preamp section has failed. It needs to go to the shop and be tested with an oscilloscope to pinpoint the problem.
DO make sure the feedback is NOT from something you have plugged into it... make sure it is there with NO input cable plugged in. Often external devices can introduce ground loops an noise like this. Lamp dimmers (even stage lighting dimmers) can be a source of interference.
The sound you hear MAY not be the full loudness as the oscillation MAY be above your hearing range. This COULD cause overheating and damage so get it fixed before using.