This Champ was one of my first ever builds. I initially had a few problems with cold solder joints that were causing some crackling but that is all worked out. Since then I noticed that, on occasion, the volume seems to fluctuate. I changed out V1 a couple of times and that would fix it. I checked the B+ voltages today after the problem returned. The voltage at the first dropping resistor is 360 DC, 358 after the first, 356 after the second, 354 at the V1 plate resistors and about 345 at the plates. It’s almost as if none of the resistors are doing much. The high voltage at the rectifier is about 325 AC. Everything is fine until it hits the dropping resistors. I believe that I checked all components before I built the amp. I assume I need to go back in and verify the values on the resistors. I did once mix up the 100k dropping resistors with the 100 ohm resistors for the heater’s virtual center tap on another build. Any other suggestions?