• Country
• United States of America (USA)

• Manufacturer / Brand
• General Radio Company; Cambridge (MA)

• Year
• 1959 ?

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 113591

• • alternative name: GenRad

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

• Number of Transistors
• 4

• Semiconductors

• Wave bands
• - without

• Power type and voltage
• Storage and/or dry batteries / 4 × 1,5 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Impedance Bridge 1650-A - General Radio Company;

• Shape
• Portable set > 8 inch (also usable without mains)

• Dimensions (WHD)
• 325 x 320 x 200 mm / 12.8 x 12.6 x 7.9 inch

• Notes

• The 1650-A Impedance Bridge was a versatile and compact instrument capable of accurate measurements of resistance, capacitance, inductance, dissipation and quality factor over a very wide range: 1 milliohm to 11 megaohm for resistance, 1 picofarad to 1100 microfard for capacitance and 1 microhenry to 1100 Henry for inductance. Accuracy better than 1% was given for R, C and L. The 1650-A used custom made precision components for the arms of the bridge: the CRL rheostat used a mechanical justifying mechanism with eight linearizing cams; a silvered mica, high precision capacitor was used as standard capacitor. The Orthonull device, with non reciprocal ganging of CRL and D dials, was available for easy of balance convergence in cases of low Q or high D.
  Virtually any impedance measurement could be done with this instruments, also relying upon the operating procedures given in its instruction manual.

  Price 440 USD

  Army technical bulletin TB 9-6625-2045-35 "Calibration procedure for impedance bridge General Radio, models 1650A and 1650B"

• Net weight (2.2 lb = 1 kg)
• 8.5 kg / 18 lb 11.6 oz (18.722 lb)

• Price in first year of sale
• 678.00 DM

• Mentioned in
• - - Manufacturers Literature

• Author
• Model page created by Emilio Ciardiello. See "Data change" for further contributors.

• Other Models

• Here you find 238 models, 212 with images and 128 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from General Radio Company; Cambridge (MA)