Trans-Solar PP706 (Ch= 1123)

• Country
• United States of America (USA)

• Manufacturer / Brand
• Hoffman Radio Corp.; Los Angeles, CA

• Year
• 1958

• Category
• Broadcast Receiver - or past WW2 Tuner

• Radiomuseum.org ID
• 158276

• Picture
• Schematics

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

• Number of Transistors
• 6

• Semiconductors
• 2N252 2N253 2N254 2N238 2N185 2N185

• Main principle
• Superheterodyne (common); ZF/IF 455 kHz; 2 AF stage(s)

• Tuned circuits
• 5 AM circuit(s)

• Wave bands
• Broadcast only (MW).

• Power type and voltage
• Solar- and/or muscle driven, also addl. power jack possible / Solar / 1 x 4 Volt

• Loudspeaker
• Permanent Magnet Dynamic (PDyn) Loudspeaker (moving coil) / Ø 2.75 inch = 7 cm

• Material
• Plastics (no bakelite or catalin)

• from Radiomuseum.org
• Model: Trans-Solar PP706 - Hoffman Radio Corp.; Los

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

• Dimensions (WHD)
• 147 x 89 x 43 mm / 5.8 x 3.5 x 1.7 inch

• Notes

• The Hoffman Model PP706 has a Pink cabinet.

  The Hoffman Model P706 series was one of the early solar-powered radios. It was introduced in June 1958 as stated in the Los Angeles Times on June 8, 1958.

  The top mounted solar panel, consisting of 12 solar cells in the shape of a quarter round, could only be used to power the radio and it did NOT act to recharge the internal 4-volt mercury battery (primary, not rechagable).  A slide switch on the back side allowed the user to choose from “SOLAR” or “BATT.”.

  The colors of the P706 series cabinets are defined by the model prefix, as shown in the following table.

  Model	Color
  BP706	Mocha
  CP706	Expresso
  KP706	Ebony
  OP706	Oyster White
  PP706	Pink
  RP706	Red
  TP706	Turquoise

  A few oddities of the P706 series are known, such as a paper label inside the battery cover shows the model number based on cabinet color – but some sets have been seen with a wrong model number label pasted inside.

• Price in first year of sale
• 75.00 USD

• Mentioned in
• Beitman Radio Diagrams, Vol. 20, 1960 (page 69, Models Series P706 Chassis 1123.)

• Literature/Schematics (1)
• Photofact Folder, Howard W. SAMS (Set 436, Folder 8, March 1959.)

• Literature/Schematics (2)
• Collector's Guide To TrR1 Bunis trans.94 (1996, page 125, BP706 "Trans Solar", (Note: only first color model listed from the series.))

• Literature/Schematics (3)
• Los Angeles Times, June 8, 1958.

• Documents regarding this model

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

• Other Models

• Here you find 927 models, 213 with images and 894 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from Hoffman Radio Corp.; Los Angeles, CA