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Best one I ever annoyed my neighbors with back in '68 was the one in the late-50's Sylvania Transistor Hobby Circuits Manual (not the one from the mid-50's). Had a decent modulation level and no "chirp" off to one side of the carrier. Could also try the phono oscillator circuit from a Philco "Beam-O-Lite" console, or the "EXT MOD" input on any old tube signal generator!
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