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)
The FB-7 and FB-X were identical seven-tube receivers, except that the X model included a crystal filter in the 500 kHz IF. Standard plug-in coils provided continuous coverage from 1.5–20 MHz, and band spread coils were available for the 160, 80, 40, and 20 meter amateur bands. The "A" version of the receivers used air-variable capacitors versus mica-compression trimmers to tune the IF transformers.
References
Review. Radio News, Oct 1933, p. 211.
Brief description, (FB-7A). Radio News, Apr 1934, p. 609.
National's notes, QST, Mar 1934, p. 65.
National's notes, QST, Apr 1934, p. 63.
National's notes, QST, Sep 1934, p. 65. (new crystal and holder)
Good information, QST Oct 1934, p. 75.
National's notes, QST, Mar 1935, p. 77. (reference to the FBX "since 1932.")
Reference to the FB-7 being retired, QST, Jun 1937, p. 71.
