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Country:  United States of America (USA)
Manufacturer / Brand:  Watkins Johnson Company, Gaithersburg (MD)
Year: 1970 ?? Category: Radio module post 1925 (not a part, not a key)
Semiconductors (the count is only for transistors) Semiconductors present.
Loudspeaker - - No sound reproduction output.
Power out
from Model: DRO-290A-1 - Watkins Johnson Company,
Material Metal case
Shape Rack
Dimensions (WHD) 19 x 1.5 x 18 inch / 483 x 38 x 457 mm
Notes digital frequency readout matching the 521A-3 SW/VHF receiver; displays up to 0,1 kHz with nixie tubes.
Source of data - - Data from my own collection

Model page created by Martin Bösch. See "Data change" for further contributors.

All listed radios etc. from Watkins Johnson Company, Gaithersburg (MD)
Here you find 18 models, 8 with images and 1 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.