• Country
• United States of America (USA)

• Manufacturer / Brand
• Triplett Electrical Instrument Co.; Bluffton (OH)

• Year
• 1958

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 340462

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

• Wave bands
• - without

• Power type and voltage
• Dry Batteries / 1.5 & 30 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Bakelite or Plastics (type unknown)

• from Radiomuseum.org
• Model: Transistor Tester 690 - Triplett Electrical Instrument

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

• Notes

• The Triplett 690 Transistor Tester has the following features:

  • Power Requirements: 1.5V and 30V batteries.
  • Panel Features: leakage-gain meter; NPN/OFF/PNP selector switch; gain test button; calibration button and adjustment; one standard transistor socket and separate collector, base, emitter test jacks with external leads.
  • Transistor Tests: base-to-collector leakage current (open emitter); current gain percentage (base grounded).
  • Accuracy: 2% of full scale deflection on 0-500 DC uA range.

  [from Lit(1) reference]

  Updated model is the Triplett 690-A.

• Literature/Schematics (1)
• PF Reporter, Aug. 1958, pages 44-46, "New Transistor Checker...Model 690"

• Author
• Model page created by Gottfried Silberhorn. See "Data change" for further contributors.

• Other Models

• Here you find 139 models, 132 with images and 50 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Triplett Electrical Instrument Co.; Bluffton (OH)