1930s style MOPA running a 89Y Clapp ECO (oscillates around 900 kHz), 802 buffer, and 811 final. Output is about 80-100W.
Schematic of exciter (oscillator/buffer) section from which this transmitter is based. 89 circuit changed to a ECO VFO in actual rig vs. crystal control as illustrated in schematic from QST.
89 ECO schematic as actually built. For 160M, oscillates around 900 kHz: