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It could be either the internal pickup is coming unglued or the electrical connections need to be re-soldered. If you're not familiar with the process, have it done by a repair shop. You risk causing more damage if you're not careful.
You can normally reset Yamaha keyboards by holding down the highest note while turning on. If you want to do a full factory reset see below - remember this may delete all songs etc you have saved to the keyboard memory.
Please check the format of file you are flaying from USB device if it is one of these supported by your system.MP3-CD MPEG1, MPEG2, MPEG4, DIVX, XVID Dolby Digital, MP3, PCM, WMA.If it is correct try to set the audio settings to simulated stereo or stereo out.Your system is a 5.1 system so it is possible that all channels will not be simulated with a stereo source.
Microphonic tubes can be detected by tapping them lightly with a pencil. I cannot find if this uses a spring reverb, but if it does, vibrating the cabinet will get a clanky type sound from the reverb tank. This MAY use a digital reverb however which is immune to that. Next thing is to make sure your guitar can't "hear" the output sound of the amp because the strings can pick up the sound and resonate feeding back into the amp. You can detect if this is happening by quickly dampening the strings and see if ringing gooes away. You probably need 6 to 10 feet of clearance between the guitar and the amp OR put your body between the amp and the guitar. ALWAYS set sound level at safe levels. Get a sound meter and go no higher than 90 Db. I know a lot of near deaf musicians whose careers are near over because of hearing loss using too high level.
The tuner on this is weird. It requires three presses of the tune button. Read your manual... One press turns on tuner and passes audio till it times out. A second turns on tuner and kills audio... the third press restores audio... Others have had the same problem understanding this three mode thing and the timeout in the first two modes is confusing when sound disappears.
The transformer is NOT likely to be damaged by what you did. The output tubes would have had a lower impedance presented to them and I suspect they may have got gassy or degraded the cathodes. Those SHOULD have been the first thing to check and change.
What you heard about the fuse blowing if tubes go is NOT always correct. If a tube shorts the fuse may go or if it becomes so gassy that it breaks down and shorts the fuse MAY go.
You will not sense as much power when connected right at the 16 ohms as you did on 8... in fact on 8 ohms the amp would probably try to deliver 50% more. If it could it would be double, but due to overloading 50% is reasonable.
This unit got a 24volt lamps that came from a transformer. Usually the ceramic contact of the lamp get damaged and corroded after some time and can be replace. You should test at the same time that the voltage is allright with a multimeter. Most sound shop keep such ceramic in stock because its always broken....
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