QST, Jun 1966, p. 145. (complete list of all models)
QST, Aug 1966, p. 119.
QST, Jan 1967, p. 107. (list of all models)
QST, Feb 1968, p. 136.
The Vanguard 301J series used three epitaxial planar UHF transistors. They had a crystal oscillator, a tuned RF stage, a low-noise mixer, and were available in a wide range of frequencies.
