Minifon Hi-Fi

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     Minifon Hi-Fi (1961 - 1967). The latest model of portable recorders Minifon series of "Protona GmbH"; Hamburg, and after 1962 - "Telefunken", Germany. At the same time (1960 - 1967) produced a similar design to the model Minifon Attache with a simplified circuit diagram.
     In a recorder, rewind on both sides, the dial gauge the level of power, volume and level of writing and with indication of hitchhiking trip. Hitchhiking is an original design. To properly install the cassette in the deck, there are two guide pins, which are also contacts hitchhiking. The magnetic tape at the beginning and end of a metallic coating, which closes the contacts, and hitchhiking trips. At the same time the red light is lit, which is located in the box to the right of the keys. Pinch roller, capstan, versatile and erase head, covered with decorative covers. Next to the plus terminal of the battery cover acts as a lever by which the tape is fed to the permanent magnet. With its help. You can quickly erase the record (both tracks at once) during the winding process.
     Structures Minifon Hi-Fi and Minifon Attache almost identical. Some additional information about these recorders can be found at Minifon Attache.

Video review

After 1962, in the United States on the label in the box between minifon & Hi-Fi could be placed logo "ITT". Photos can be enlarged

     The recorder is turned off when the button "Stop" is pressed until it locks. Rewind is activated when you click on "Rewind". Reproduction in if you press and release the "Listen". This button does not commit, and when it is turned off you lock all the buttons. That is, play on, when you do not press any of the buttons. Hold the button "Listen" in the down state includes fast forward. Pressing "Record" includes a fix to the recording mode. Wiring collected at 11 transistors. Four transistor amplifier is used in a generic, three in the stabilizer motor speed, the generator 2 in erasing a power amplifier in the stabilizer, and one as a key management hitchhiking. The bandwidth of frequencies, 40 - 12 000 Hz. The apparatus consists of a molded body, and inserted into a deck, which is available all the mechanics and electronics. The board is connected to the amplifier electronics deck with desyatikontaktnogo connector and secured to it with two screws. 

This unit was manufactured in 1962, as indicated by a red stamp on the cardboard inside

     As an accessory to recorders made Minifon desktop speakers with an amplifier, combining the functions as a microphone and transmitter for non-contact recording from the telephone. For more details about their designs on the pages can be Minifon Attache-Speaker and Minifon P55-Speaker

For recorders Minifon made a lot of accessories. Here are some of them

In the photo at the bottom right miniature microphone with clip for attaching to clothing

The original batteries 12 v for the type recorders Minifon

On the left of the original design of the battery 12 v

     Unlike previous models, write to the wire in Minifon Hi-Fi uses a compact tape cassette with a standard width of 1/4 inches. This model began producing in 1961, and still continued to manufacture the latest version of the wire, Minifon Protona Special. In 1962, "Protona GmbH" has become part of the company "Telefunken", and until 1967 Minifon Hi-Fi produced under the brand name "ITT". As design complexity Minifon Hi-Fi surpasses all previous models Minifon, all existing at that time recorders in the world. It is a real marvel of engineering and manufacturing technology of the time. Dimensions of the recorder 177 x 102 x 42 mm. Weight without batteries 800 grams, power supply 12 v, a special battery, which has no modern analogues. Original cartridge has dimensions of 110 x 78 x 11.5 mm and weighs in '50 produced cassettes, designed for 1 hour (2 x 30 minutes), ½ hour (2 x 15 minutes) and 12 (2 x 6) minutes of recording time .
     The recorder has got me in great cosmetic condition, but not intact. Since I already have a similar defective Minifon Attache, this unit, I decided not to repair.

Wiring diagram and specification Minifon Hi-Fi. Photos from the book by Roland Shellin "Minifon Spy in your pocket", (Roland Schellin, "Minifon Der spion in der tasche")

Operating Instructions Minifon Hi-Fi

A photo is lower, a price and the prospectus to recorder Minifon Hi-Fi. The given model differs from Attache more complex electrocircuit on 11 transistors, providing a passband of frequencies 40 - 12000 Hz. They were made with 1961 for 1967