• Country
• USA (Stati Uniti d'America)

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

• Year
• 1955 ?

• Category
• Radio (o sintonizzatore del dopoguerra WW2)

• Radiomuseum.org ID
• 82025

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

• Number of Transistors
• 8

• Semiconductors
• CK761 CK761 CK760 CK760 CK760 CK722 CK722 CK722 CK760 CK760 CK760 CK760 CK760 CK721 CK721 CK721

• Main principle
• Supereterodina (in generale); ZF/IF 455 kHz; 2 AF stage(s)

• Tuned circuits
• 5 AM circuit(s)

• Wave bands
• Solo onde medie (OM).

• Power type and voltage
• Batterie a secco / 4 x 1.5 Volt

• Loudspeaker
• AP magnetodinamico (magnete permanente e bobina mobile) / Ø 3.5 inch = 8.9 cm

• Material
• Pelle / stoffa / plastica ma con altro materiale sottostante

• from Radiomuseum.org
• Model: Transistor Radio 8TP4 Ch= 8RT1 [red] - Raytheon Mfg. Co.; Cambridge,

• Shape
• Apparecchio portatile > 20 cm (senza la necessità di una rete)

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

• Notes

• Just a few weeks after Regency (IDEA) has launched the first transistor radio, Regency TR-1 with 4 transistors, Raytheon brought its much bigger 8TP with the models 8TP-1 (tan leather), 8TP-2 (brown leather), 8TP-3 (beige leather) and 8TP-4 (red leather) - all in 1955 and with 8 transistors really outperforming TR1. This was the second transistor radio built in series in the world, followed by SONY models (e.g. TR-55). But the first SONY to appear in the USA was TR-63 in 1957. See also the pocket transistor radios from GE as models 675, 676, 677 and 678 depending in color from 1955. The 8TP1 was immediately followed by a 7 transistor with the same model names! CK761 CK761 CK760 CK760 CK760 CK722 CK722 CK722
  
  8 Raytheon transistors (see the two schematics on the model page for 8TP1): 2 of CK761 (oscillator, mixer), 3 of CK760 (IF and detector) and 3 of CK722 for audio (driver, push-pull). The first series had 5 x CK760 and 3 x CK721.
   

• Price in first year of sale
• 80.00 $

• Circuit diagram reference
• Beitman Radio Diagrams Vol. 16, 1956

• Mentioned in
• The Collector's Guide To Antique Radios 2. Edition

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (Set 292 Folder 9 dated 10-55)

• Author
• Model page created by Egon Penker. See "Data change" for further contributors.

• Other Models

• Here you find 331 models, 153 with images and 247 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Raytheon Mfg. Co.; Cambridge, MA