Why is there no sound or very low level, highly distorted sound from one channel even though all of the tubes are glowing?
A. The output stage of your amplifier is protected by fuses in the plate circuit of the output tubes. There is one “plate” fuse per channel. These are in the large fuse holders located on the back or top deck of the amplifier. Most likely there is a blown “plate” fuse in the channel in question. Check to see if the LED associated with one of the fuses is glowing red. If so, that plate fuse is blown and will need to be replaced. Be sure to turn the power amplifier off before replacing the plate fuse, as these fuses operate at a very high voltage. A blown plate fuse indicates a possible problem with the associated power tube. It may have occurred because of a voltage spike but it may also have occurred because the power tube may need to be replaced. If the unit continues to blow plate fuses then you need to either replace the tube or contact conrad johnson for repair. DO NOT SUBSTITUTE OTHER FUSES OR VALUES AS THIS CAN CAUSE DAMAGE TO YOUR AMPLIFIER!
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