• Country
• Japan

• Manufacturer / Brand
• Seiki Electronics Inc.

• Year
• 1977 ?

• Category
• Amateur-Receiver (amateur bands, may include broadcast bands)

• Radiomuseum.org ID
• 114910

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

• Number of Transistors
• Semiconductors present.

• Semiconductors

• Main principle
• Wadley-Loop principle (including dual superhet)

• Wave bands
• Broadcast plus more than 2 Short Wave bands.

• Power type and voltage
• Alternating Current supply (AC) / 220 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 8 cm = 3.1 inch

• Material
• Metal case

• from Radiomuseum.org
• Model: Century-21 - Seiki Electronics Inc.

• Shape
• Tablemodel, low profile (big size).

• Dimensions (WHD)
• 335 x 152 x 250 mm / 13.2 x 6 x 9.8 inch

• Notes

• General coverage receiver 500 - 30000 kHz, AM, USB/LSB; using wadley loop technique, 1 MHz - bands, linear analog readout, preselector.
  Technically similar to Drake SSR-1 and very similar to Standard C-6500 .

  Please note the 'Century 21' schematics in Radiomuseum apply to the later Century 21D with digital frequency readout; diode switched 455kHz ceramic filters and three Plessey SL1641C mixers.

  The Century 21 actually has the same schematic as the Standard C-6500, with no readout; double diode mixers, and two SFD455 filters with switched 30pf and 60pf capacitors across them. 

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

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

• Other Models

• Here you find 4 models, 4 with images and 2 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Seiki Electronics Inc.