Hello, I recently i replaced the can capacitors the black diodes, and a couple of big resistors. on the demon 250. It worked great for about a month. Then it started to surge, and dim the lights in the room. then it stopped putting out full power. it only puts out about 70watts am down from 220watts dead key. The middle tune knob goes all the way to the left to increase power now. I used an extra tube to swap out with the ones in there but that wasnt much difference Im looking for a schematic with voltages, and ohms but so far no luck does anyone have any ideas how i can track down the problem Thanks Robert