Now that hamfests are getting started again, keep your eyes open for a WW2 Command Set transmitter, 7.0 to 9.1 MHz. It has the VFO built in and uses a pair of 1625 tubes. As a technician class back in the early 70s I converted one into a 6 meter transmitter and added high-level AM super-modulation with a 4x6L6GB 75 watt PA amplifier. I don't remember the exact chassis tag number, but it worked great for band openings during Cycle 20.