• Country
• United States of America (USA)

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

• Year
• 1959

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 309918

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

• Main principle
• ZF/IF NA kHz

• Wave bands
• - without

• Power type and voltage
• Storage and/or dry batteries / 30V (Eveready 413) and 6V (Eveready 724) Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Bakelite or Plastics (type unknown)

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

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

• Notes

• From the 1960 advertisement:

  "Triplett Model 690-A Transistor Tester is a rugged, small, easily portable unit. Battery operated. It provides Leakage and Gain tests for all low and medium power PNP and NPN type transistors. Also checks diodes for forward and leakage current. A single switch is provided for simplicity in selecting transistor type settings. The OFF position prevents drain on the batteries in case of accidentally shorting the leads. Another operating feature is the use of separate "Calibrate" and "Gain" buttons to eliminate errors. A transistor socket and a set of external leads are provided for use with any basing arrangement."

  Earlier model is the Triplett 690.

• Net weight (2.2 lb = 1 kg)
• 1 lb (1 lb 0 oz) / 0.454 kg

• Price in first year of sale
• 29.50 $

• Mentioned in
• Radio Electronics (U.S. Magazine) (June 1960, advertisement on page 2)

• Literature/Schematics (1)
• Electronics World, July 1959, page 143, Triplett ad "Model 690-A, a new Transistor Tester"

• Author
• Model page created by Kenneth Lew. See "Data change" for further contributors.

• Other Models

• Here you find 141 models, 134 with images and 53 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Triplett Electrical Instrument Co.; Bluffton (OH)