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Could be a few things, most simple the Tubes, and or biasing, I have had a few amps that certain notes or chords would cause harmonic distortion within the tubes, and the tubes where good? Another possibility is the output transformer? Sometimes when they are failing the volume varies... hope this helps?
This is a tough one because your LED for the Level Set is Illuminated, meaning that it sees a signal. With that being the case, the signal from the mic is getting from the input jack to the channel strip, but is not passing through to the preamp for that channel. So....either the channel strip is faulty, or the circuit going to the preamp is bad. As the other channels are probably ok, the trouble is most likely in the channel strip for Channel 1. Definitely have this looked at by a tech familiar with Behringer boards. If you can function without that channel, it will be cheaper than the repair, as the design of your board prohibits swapping out channel banks. I wish you luck and success with this issue.
More infornation is required to provide a real answer, but I can give you a few possibilities:
1) There is a problem within the feedback loop that is allowing some frequencies through. This will be more prevelant at higher volume levels.
2) If there is a tube pre-amp section, the tube can be "microphonic". This too is generally more likely at higher volume levels.
3) Defective components in the amp section. These may pass some DC voltages that will sound like distortion.
If you can, please experiment a little to try to find when the problem is most obvious. With more details about when the problem occurs may give us enough info to determine the cause. Otherwise a trip to a service shop that has access to test equipment will be required.
Check the quality of the DC bias as being free of ripple.across teh 25 mfd/50v cap filtering the bias.
If much ripple there, replace the cap. Also the .05 bypass on the swinger of the intensity control.
This should be an easy fix, but you might need an oscilloscope to diagnose it quickly... or just parallel caps across these to see if it kills the hum.
The main high voltage filter caps are also suspect as well as the bypass of power to the ealier inverter stage a 16mfd/450v
There are lethal voltages in this so use great caution when troubleshooting... the caps hold a nasty charge.
This will ensure that the signal won't have any odd hiccups due to an odd pedal setup. But if you play around with different orders, you can end up with some very interested sounds.
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