• Country
• United States of America (USA)

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

• Year
• 1945 ??

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 83057

• • alternative name: GenRad

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

• Number of Tubes
• 3

• Valves / Tubes
• 6H6 6SL7GT 6SL7GT

• Power type and voltage
• Alternating Current supply (AC) / 110/220 Volt

• Loudspeaker
• - For headphones or amp.

• Material
• Wooden case

• from Radiomuseum.org
• Model: Impedance Bridge 650-AP - General Radio Company;

• Shape
• Tablemodel, slant panel.

• Dimensions (WHD)
• 12 x 8.5 x 20 inch / 305 x 216 x 508 mm

• Notes

• There are 4 Modes to supply the bridge with the test voltage:
  1)built-in Direct Current;
  2) built-in mechanical vibrator at 1 kHz;
  3) electronic 1 kHz oscillator, part of the selective amplifier plug-in (650-P1);
  4) external generator voltage.

  Tube 6SL7GT is on the market not earlier than 1941 or 1942.
  
  Die Impedanz-Messbrücke kann auf 4 verschiedene Arten mit einer Brückenspannung versorgt werden:
  1) interne Gleichspannung;
  2) eingebauter mechanischer Summer 1 kHz;
  3) elektronischer 1 kHz Oszillator im Verstärker-Einschub (650-P1);
  4) externe Generatorspannung.

• Net weight (2.2 lb = 1 kg)
• 13.6 kg / 29 lb 15.3 oz (29.956 lb)

• Price in first year of sale
• 425.00 $

• Source of data
• -- Original-techn. papers.

• Author
• Model page created by Felix Schaffhauser. See "Data change" for further contributors.

• Other Models

• Here you find 241 models, 212 with images and 131 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from General Radio Company; Cambridge (MA)