• Country
• United States of America (USA)

• Manufacturer / Brand
• Raytheon Mfg. Co.; Cambridge, MA

• Year
• 1955/1956

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 228409

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

• Number of Transistors
• 7

• Semiconductors
• CK759 or. CK760 CK760 CK760 CK721 CK721 CK721 CK721 1N295

• Main principle
• Superheterodyne (common); ZF/IF 455 kHz; 3 AF stage(s)

• Tuned circuits
• 5 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Dry Batteries / 4 x 1,5 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil)

• Material
• Leather / canvas / plastic - over other material

• from Radiomuseum.org
• Model: Transistor Radio 8TP1 Ch= 7RT1 [tan] - Raytheon Mfg. Co.; Cambridge,

• Shape
• Portable set > 8 inch (also usable without mains)

• Dimensions (WHD)
• 9.25 x 7 x 2.75 inch / 235 x 178 x 70 mm

• Notes

• Soon after the 8TP-series was in production, a new 7-transistor 1-diode circuitry was introduced, the 7RT1.
  Only 3 RF-transistors (instead of 5 in the original 8RT1 circuit) were used for 
  oscillator-, mixer-, and the one-transistor IF-stage. Followed by: diode detector, 1st AF-stage, AF driver and the 2-transistor push-pull output stage.

  The 7RT1 chassis was actually the original 8TP-chassis, with one transistor socket intentionally not assembled.
  This was modified in the 7RT1B-chassis

  Late units were equipped with 3x CK760, 1N295, 2N130, 2N132, 2x2N138

  Available colours: 8TP1 (tan), 8TP2 (brown), 8TP3 (beige) and 8TP4 (red)

• Net weight (2.2 lb = 1 kg)
• 1.650 kg / 3 lb 10.1 oz (3.634 lb)

• Mentioned in
• Transistor Radios 1954-68 (p.51)

• Literature/Schematics (1)
• Milton S. Kiver Transistors in Radio, Television and Electronics 2nd Edition 1959 p.170

• Author
• Model page created by Wolfgang Gebert. See "Data change" for further contributors.

• Other Models

• Here you find 315 models, 151 with images and 230 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Raytheon Mfg. Co.; Cambridge, MA