OK looks like the last thread I tried didn't make it. I see that the preamps are made of 12AX7 tubes in a Class A configuration. The outputs all see to be made from FETS in a class D configuration. What happened to the output being a Class AB push pull tube configuration. Don't they make them anymore??? Can you buy a kit and assemble it your self with matched tubes. What gives. That should be Class not c all in the subject line.