Note
QST, Jan 1950, p. 88.
QST, Apr 1950, p. 115. (TR-75TV)
Good photo: QST, Oct 1951, p. 81.
Allied Radio catalog 1952 (copyright 1951), p. 139.
Good photo: QST, Feb 1952, p. 72.
QST, Jul 1952, p. 103. ("More effective TVI protection.")
Allied Radio catalog 1953 (copyright 1952), p. 40.
Walter Ashe catalog 1954, p. 12.
Allied Radio catalog 1955 (copyright 1954), p. 193. (slightly different version)
In April 1950, a version of the TR-75 was offered that included a low pass filter for TVI protection, which added $10 to the cost. This was called the TR-75TV. The standard version was also still available.