Note
QST, Feb 1951, p. 4.
QST, Sep 1954, p.100.
Allied Radio catalog 1955 (copyright 1954), p. 187. (R-46A)
QST, Dec 1955, p. 4. (R-46B)
Ten inch speaker with 3.2 Ω coil. Includes a matching transformer for 500/600 Ω input.
R-46A deletes the matching transformer.
R-46B appears to the the same as R-46A.