Note
Lafayette catalog number 55, p. 68.
QST, Mar 1933, p. 77.
QST, Apr 1933, p. 54 (FB-X or FBX)
QST May 1933, p. 59. (Good internal photo of FB-7 )
Radio News, May 1933, p. 697.
QST, Jun 1933, inside back cover. (use of "true tracking")
Radio News, Aug 1933, p. 105.
QST, Jun 1933, p. 57. (Good internal photo of FB-X )
QST, Jul 1933, p. 79. (first reference to FBX-A)
QST, Sep 1933, p. 59. (first reference to FB-7A)
Good information QST Oct 1934, p. 75
See National's notes: QST, Mar 1935, p. 77. A reference to the FBX "since 1932."
See National's notes: QST, Mar 1934, p. 65.
See National's notes: QST, Apr 1934, p. 63.
See National's notes: QST, Sep 1934, p. 65. (new crystal and holder)
A reference to the FB-7 being retired: QST, Jun 1937, p. 71.
References
Review. Radio News, Oct 1933, p. 211.
Brief description (FB-7A). Radio News, Apr 1934, p. 609.
