• Country
• United States of America (USA)

• Manufacturer / Brand
• Franklin Electronics Inc.; Bridgeport, PA.

• Year
• 1959

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 207403

• Number of Tubes
• 42

• Valves / Tubes
• 12AT7 12AX7 12AU7 6J6 12B4 6AS6 5963 6844 BD310 0G3 0A2

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 120 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Digital Multimeter 500 - Franklin Electronics Inc.;

• Shape
• Boatanchor (heavy military or commercial set >20 kg).

• Dimensions (WHD)
• 11.5 x 12 x 19 inch / 292 x 305 x 483 mm

• Notes
• This is very early, accurate (chopper-stabilized) digital multimeter, utilizing four Burrough's Nixie tubes as readouts. The tube list above lists only unique numbers; the actual tube count is eleven 12AT7s, nine 12AX7s, one 12AU7, fourteen 6J6s (mostly used as Nixie tube drivers), one 12B4, one 6844 (most-significant digit Nixie tube with multiplexed anode), three BD310s (Nixie readout with one pin per cathode, common anode), one 6AS6, one 5963, two 0A2 tubes, one 0G3 tube. Power supply has six silicon rectifiers.

• Net weight (2.2 lb = 1 kg)
• 46 lb (46 lb 0 oz) / 20.884 kg

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

• Author
• Model page created by Hank Kaczmarski. See "Data change" for further contributors.

• Other Models

• Here you find 1 models, 1 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Franklin Electronics Inc.; Bridgeport, PA.