That must have been built - when, about 1948?, before the 250-GY came out. Phil Alexander, CSRE, AMD -----Original Message----- >From: Jerry Mathis <thebeaver32 at gmail.com> > >That would probably be 810's. My first transmitter I ever worked on was a >Gates 250-C-1. 6L6 audio drivers, and a single 813 for RF driver.