Note
QST, Nov 1954, p. 88.
QST, Jan 1955, p. 91.
QST, Jan 1955, p. 101. "Matchmaker" also referred to as "Matchmaster."
650 - 52Ω
651 - 73Ω
Still available surplus as new-old-stock: CQ, Feb 1963, p. 98.
References
Brief description. Electronics World, May 1959, p. 150.