The 630M MOPA (89/802/811) was displayed at the Dayton Hamvention as part of the homebrew theme this year. Plenty of questions were asked and photos taken like the one below!
630M MOPA (Master Oscillator – Power Amplifier) consists of an 809 “High-C” Hartley capacitively coupled to a push-pull power amplifier, either running 809s or 811s.
Power output is on the order of 100-165W with 1600V on the amplifier tube plates. CW note is clean and stable (slight chirp reported over the air).
Classic Hartley transmitter using an 811 tube. Aprrox. output 45-65W (depends on coupling).
Rig is mounted on a 21 in. L x 18 in. deep board, cut from a 48×18 prefabricated, edge-glued shelf board from big-box home improvement store. Stained with dark walnut finish.