This shows the completed James Millen 500w transmitter in my shack connected up with a 1946 vintage HRO-5RA1. The 90700 Vari-arm VFO is setting on top of the HRO-5 speaker. In the photo, you can see the two meters and the green and red lights on the bottom panel of the transmitter; that is the front panel of the power supply for the tabletop portion of the transmitter. The Millen modules, from top to bottom are the 90881-500w RF deck with 812A tubes running class C. The 90905 5" scope to monitor the RF envelop or trapezoid pattern. The 90800-50w exciter with 6L6 and 807 and the 90831-speech amp with 6146's in its output driving the grids of the 811A's in class B in the power modulator.