• Country
• United States of America (USA)

• Manufacturer / Brand
• Simpson Electric Co.; Chicago, IL - Lac du Flambeau, WI

• Year
• 1950 ?

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 75812

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

• Number of Tubes
• 2

• Valves / Tubes
• 12AU7 6AL5

• Wave bands
• - without

• Power type and voltage
• Alternating Current supply (AC) / 105-125 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Bakelite case

• from Radiomuseum.org
• Model: Vacuum Tube Volt-Ohmmeter 303 - Simpson Electric Co.; Chicago,

• Shape
• Very small Portable or Pocket-Set (Handheld) < 8 inch.

• Dimensions (WHD)
• 5.25 x 7 x 3.12 inch / 133 x 178 x 79 mm

• Notes

• Versatile VTVM with 4.5" scale. Uses include DC voltmeter, ohmmeter, AC or AF voltmeter, RF voltmeter (with accessory probe), ouputmeter and others.

  DC Voltage: Ranges 1.2, 12, 60, 300, 1200
  AC Voltage: Ranges 1.2, 12, 60, 300, 1200
  AF Voltage: Ranges 1.2, 12, 60
  Ohms: Ranges 1K ohms (10 ohms center); 100K ohms (1000 ohms center); 1 megohm (10K ohms center); 10 megohms (100K ohms center); 1000 megohms (10 geohms center)
  Decibels: -20 to +63 dB in 5 ranges
  RF Voltage: 20 volts maximum. Frequency flat 20 Kc to 100 Mc

  Zero-center scale for FM discriminator alignment.

  Price including DCV Probe, ACV-Ohms Probe, Ground Lead in 1957: $68
  Model 303-RT (in Roll-Top Safety Case) in 1957: $76

• Net weight (2.2 lb = 1 kg)
• 4 lb (4 lb 0 oz) / 1.816 kg

• Price in first year of sale
• 58.75 USD

• Source of data
• Radio Electronics (U.S. Magazine)

• Mentioned in
• Allied Radio Catalog (Knight) (Nº 150, 1956)

• Literature/Schematics (2)
• 1951 Newark catalog Nº 51

• Literature/Schematics (3)
• - - Manufacturers Literature (Simpson Test Equipment bulletin no. 2058, 1957)

• Author
• Model page created by Martin Dill. See "Data change" for further contributors.

• Other Models

• Here you find 147 models, 130 with images and 60 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Simpson Electric Co.; Chicago, IL - Lac du Flambeau, WI