Hi. I have been building a Dumble Tweedle Dee Champ amp. Now finished it makes no sound, except scratch sounds on the preamp/PT tubes, and a very low noise when touching the jack tip. I get voltage on all parts that should have and I have changed the filter caps, many of the resistors, looked closely on the input jacks and changed the tubes. The OT wires I have connected the 0v to the 6v6 tube and the 8k to the rectifier. I have connected the 5v and 0v to the rectifier. This looks like a straight forward build, so I am a bit puzzled? Any immediate ideas on what to look for next?