• Country
• United States of America (USA)

• Manufacturer / Brand
• Sencore; Sioux Falls (SD)

• Year
• 1956

• Category
• Service- or Lab Equipment

• Radiomuseum.org ID
• 336001

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

• Wave bands
• - without

• Power type and voltage
• Dry Batteries / 6 Volt

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: Transistor Crystal Diode Checker TDC22 - Sencore; Sioux Falls SD

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

• Dimensions (WHD)
• 4.5 x 3 x 5 inch / 114 x 76 x 127 mm

• Notes

• The Sencore TDC22 tests for open and shorts and transistor quality, leakage and gain (beta).  Three leads are attached for connection to Emitter, Base, and Collector.  The small user instruction guide and transistor setup charts were placed in a pocket on the back side of the device.

  The unit was also sold under Sencore's earlier name of Senco but the model number is the same for both. It was initially advertised under the Senco name in 1956 but under the Sencore name in 1957.  The 1957 ad states "formerly Senco".  Both names were trademarks of the Service Instruments Company.

• Price in first year of sale
• 15.95 US$

• Mentioned in
• Radio Electronics (U.S. Magazine) (advertisement February 1957)

• Literature/Schematics (1)
• Radio Electronics (U.S. Magazine) (advertisement September 1956, "New Senco Transistor Tester" TDC22)

• Literature/Schematics (2)
• - - Manufacturers Literature (Accompanying user instructions)

• Author
• Model page created by Rich Post. See "Data change" for further contributors.

• Other Models

• Here you find 64 models, 62 with images and 39 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Sencore; Sioux Falls (SD)