I have a NC 183D that I need some information about. The manual I downloaded from BAMA shows the phase inverter to be a 6J5. The radio I have uses a 6SN7 to do that job. I wonder if anyone has a manual with the diagram of the 6SN7 inverter? If so, I would like a copy and will pay copy and mailing costs. Any help appreciated. 73 Jim de W5JO