So I built a hybrid between a JTM45 and a 50W plexi. It uses George's JTM45 board, but has MM 50W OT and PT, a tube rectifier, and EL34's. It's similar to the earliest 50 watters that marshall made. Anyway, it works relatively well, but there are a few things that unsettle me. First off, when I crank the high treble loudness (the normal loudness is at 0), and no guitar or cable is plugged in, I get a very raspy, intermittent hum/static type of sound. What could be the possible cause? Also, just a few hours ago, i lightly tapped the chassis while it was on, and now there's a distinct hum, even when both volumes are at 0. If I plug a guitar in, you can faintly hear it through the amp, despite the volumes being at 0. What did i bump out of place? Now the oddest thing is the voltage throughout the amp. I'll include my voltage chart with this, take special note of the voltages in V3. They're very odd, especially the difference between pins 1 and 6. I checked all the connections on my board with a multimeter, they're all correct. All the resistors test as correct. What could this be attributed to? Does anyone have any solutions or recommendations?
Thanks a million,
Aaron
![Image](http://img.photobucket.com/albums/v221/Aaron0602/VoltageChart.jpg)