51J-2 (R-381)

• Country
• United States of America (USA)

• Manufacturer / Brand
• Collins Radio Company; Cedar Rapids (IA)

• Year
• 1949–1951

• Category
• Commercial Receiver (may include amateur bands)

• Radiomuseum.org ID
• 96987

• Picture
• Schematics

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Click on the schematic thumbnail to request the schematic as a free document.

• Number of Tubes
• 17

• Valves / Tubes
• 6AK5 6BE6 6BA6 6BE6 6BA6 6BE6 6BA6 6BA6 6BA6 12AX7 12AX7 12AX7 6AQ5 6BA6 5V4 0A2 6BA6 6BA6

• Main principle
• Superhet, double/triple conversion

• Wave bands
• Wave Bands given in the notes.

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

• Loudspeaker
• - For headphones or amp.

• Material
• Metal case

• from Radiomuseum.org
• Model: 51J-2 - Collins Radio Company; Cedar

• Shape
• Rack

• Dimensions (WHD)
• 19 x 13 x 10.5 inch / 483 x 330 x 267 mm

• Notes
• This is common for the 51J-1 and 51J-2, which both show on their faceplate only 51J without suffix. The difference is an additional toggle switch left of the meter and wording on crystal cal. switch changed to "Calibrate". 0.5 - 30 MHz, AM/CW/MCW. Principle: Superheterodyne, single, double or triple conversion. Triple conversion was used in the first band (540 - 1500KHz), single conversion in bands 2 and 3 and double conversion in the other bands. Tuning range 0.5 - 30.5 MHz in 30 1MHz bands. Fixed IF: 500 KHz

• Net weight (2.2 lb = 1 kg)
• 18 kg / 39 lb 10.4 oz (39.648 lb)

• Source of data
• Communications Receivers

• Author
• Model page created by Konrad Birkner † 12.08.2014. See "Data change" for further contributors.

• Other Models

• Here you find 100 models, 77 with images and 35 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Collins Radio Company; Cedar Rapids (IA)