Hard to beat a 6AG7 oscillator driving an 807, as others have mentioned. Any number of designs out there from QST plus commercial Knight T-50, Johnson Adventurer, and others. You could do worse than putting together a Globe Scout without the AM modulator. 6V6 or 6AG7 oscillator and 6146 final. Or a Globe Chief 6AG7 oscillator and 2x 807 final. Simple, effective, no neutralization needed.