The GE models 675/676 All-Transistor radio used a (+) positive ground chassis and used the voltage tap of -4.5 volts and also the -13.5 volts, for its main battery line voltages. Other battery manufacturers also make this same "special" battery application, like the Rayovac 1900, Burgess XX9, and RCA VS304. But, this battery can also supply another voltage, which is the tapped voltage of (4.5v), which you will get if you hookup the two top battery marked pins of (9v) and (13.5v). The battery has three female pin holes at the top that are labeled (-), (9v), and (13.5v). This battery also had a voltage tap at 4.5 volts and 9 volts, with a combined total of 13.5 volts. The carbon-zinc DC battery used was an Eveready #239, that had (9) individual 1.5 volt batteries that were all stacked up in series. The GE All-Transistor "pocket" radio's circuitry uses a DPST on/off volume control switch, that also uses a "special" 3-male pin battery connector, for a dual-voltage battery supply. frequency and its RF dial tuning range was from 540 kHz - 1620 kHz. The GE All-Transistor "pocket" radios had used 455 kHz for its I.F. The transistors 2N78 AF signal detector and 2N44 Audio Output transistors are not located under the top copper shield plate and are easily accessible on top of chassis, if you had to replace them. You would have to just bend up each copper cut-out tab, to gain access to the transistor needed to be replaced, instead of de-soldering and removing the entire top copper shield plate. And if you have to replace any of these transistors, then GE had provided copper cut-out tabs over each of these transistors in the top copper shield plate. transistors are located underneath the top copper shield plate. tuning coil cans and is used to prevent "unwanted" radio frequency interference signals from entering this radio's circuitry. The top of the chassis has a "special" copper shield plate that is soldered to the tops of the Osc.+ I.F. All of these transistors and its electronic components were soldered onto a bottom printed circuit board. All of these were PNP alloy-fused junction germanium transistors, except for the 2N78, which was a rate-grown NPN germanium transistor. The 1955 GE models 675/676 circuitry consisted of (5) General Electric germanium transistors, which were the following: 2N136 (converter), 2N137 (1st I.F.), 2N135 (2nd I.F.), 2N78 (AF Detector), 2N44 (Output). Note: The model 676 Ivory color All-Transistor "pocket" radio is sitting in the middle of top shelf behind Santa Claus. Below is an advertisement in December 1955, which shows the two model colors of Black and Ivory that were available for the 1955 Christmas season. General Electric's First All-Transistor "pocket" radios were the models 675 and 676, which came in the colors of Black and Ivory. And it measured: 5 5/8" length x 3 3/16" high x 1 1/2" deep, and it weighed 15 oz.īelow is GE's 1955 official Press Release photo of its First All-Transistor "pocket" radio This GE All-Transistor "pocket" radio was selling for a retail price of $49.95. General Electric also reported its "New" All-Transistor "pocket" radio development and production, in its September 1955 Monogram monthly employee magazine. General Electric was the 2ND American-Made company to develop and produce an all-transistor " pocket" five-transistor radio, which it announced in the Wall Street Journal's August 24th, 1955 edition. 4th, 1955 and it went on sale to the public on March 1, 1955. Raytheon had first made this announcement in the Wall Street Journal on Jan.
Ge transistor radio vintage portable#
Raytheon had announced and produced the World's 2nd All-Transistor radio model 8TP, at the beginning of 1955, but it was a "large" portable eight-transistor radio.
The original invention and production of the World's first all-transistor "pocket" Regency TR-1 four-transistor radio, was announced on Oct 18th 1954 in the New York Times edition, and started to be produced by I.D.E.A.
I noticed that there is a lot of information written on the 1954 Regency TR-1, but very little is written on the 1955 GE's First All-Transistor "pocket" radios. I decided to write a technical and informative article on the 2ND All-Transistor " pocket" American-Made radio, that was developed and produced by General Electric in 1955.
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