Note
QST, Nov 1966, p. 123.
QST, Apr 1967, p. 5.
QST, Jan 1968, p.5
QST, Nov 1968, p. 151.
QST, Jan 1969, p. 129.
QST, Jan 1970, p. 137.
Type OK – CPO and monitor
Type OM – CPO only
Type OCP – speaker, tone control, monitor, headphone jack.
Type OCM – unknown features
Variations: Kit or wired, with or without CW monitor.