• Country
• United States of America (USA)

• Manufacturer / Brand
• Watkins Johnson Company, Gaithersburg (MD)

• Year
• 1965 ?

• Category
• Commercial Receiver (may include amateur bands)

• Radiomuseum.org ID
• 115604

• Number of Transistors
• 38

• Semiconductors

• Main principle
• Superheterodyne (common); ZF/IF 21,4 kHz

• Wave bands
• Wave Bands given in the notes.

• Power type and voltage
• Alternating Current supply (AC) / 115/230 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 7 cm = 2.8 inch

• Power out
• 0.1 W (unknown quality)

• Material
• Metal case

• from Radiomuseum.org
• Model: 504A - Watkins Johnson Company,

• Shape
• Rack

• Dimensions (WHD)
• 19 x 3.5 x 15.5 inch / 483 x 89 x 394 mm

• Notes
• VHF Receiver 54 - 260 MHz in one band. AM, FM and CW reception. Two IF bandwidths: 10 and 300 kHz. Xtal marker. Made by CEI (Communications Electronics Inc.). In the late 1960s, Watkins Johnson (WJ) purchased CEI.

• Net weight (2.2 lb = 1 kg)
• 6 kg / 13 lb 3.5 oz (13.216 lb)

• Price in first year of sale
• 1,750.00 $

• Source of data
• - - Data from my own collection

• Author
• Model page created by Juhani Makivuoti † 21.09.13. See "Data change" for further contributors.

• Other Models

• Here you find 18 models, 9 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Watkins Johnson Company, Gaithersburg (MD)