Note
QST, Apr 1964, p. 5.
QST, Apr 1965 p. 119.
QST, Jan 1966, p. 108.
QST, Jul 1967, p. 127.
QST, Jan 1968, p. 125.
QST, Feb 1968, p. 121. (advertised as the "new" HXL-1) (inside photo)
QST, Nov 1969, p. 4.
QST, Jan 1970, p. 4.
QST, Nov 1970, p. 160. (this could be a factory close-out)
Review: QST, Jun 1964, p. 55.
HXL-1, written on the front panel as HXL-ONE.
