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Minifon P55 "Plexi"




Used Google translator

     Minifon P55 "Plexi".      Portable lamp wire recorder. Made in Germany by "Protona GmbH"; Hamburg. P55 recorders manufactured from 1955 to 1960, but this unit is the first series in the plastic case was made not later than 1957. That's what this says Roland Shellin in soybean book "Minifon Spy in the pocket" (Roland Schellin, "Minifon Der spion in der tasche"), in which he talks about the history of all models Minifon.


  Translation: The original machines were still P55 plastic case.   Translation: The original design of the whole was placed in a plastic case. Therefore, devices in this series was often called procto "Plexi". Starting around 1957 plastic housing was replaced by cast-art magnesium alloy.  

Video review

   Dimensions recorder 177 x 102 x 40 mm. Weight 600 g without batteries. As the magnetic carrier used wire from a special magnetic alloy with a diameter 0,05 mm or 0,038 mm. Circuit collected on three subminiature vacuum tube (See wiring diagram at the bottom of the page), in connection with which to supply the required three different voltages. Engine 6 - 12 v, the anode voltage - 30 v, filament voltage - 1,5 v. The engine has electromechanical stabilization speed. On the shaft of the engine is a centrifugal regulator. Electric stabilizer consists of several parts, one of which - a diode protection for the engine. Active element of the stabilizer is a miniature incandescent lamp. During the unit head moves up - down uniformly laying wire on the coil. In combination with good stabilization of the rotational speed of the engine, it allows to minimize the distortion of records associated with the unstable speed wire. There hitchhiking. When the coil wire ends, she pressed the lever is released. This lever, in turn, presses the power circuit breaker, located under the coil. When firing hitch red signal lamp lights. It is known that the model P55 in 1955 sold for $ 289.50.
     Structurally Minifon P55 "Plexi" is very different from later models P55. In the "Plexi" top cover contains no loops, it just slipped from the top and latch, and jack of the external power launched into the side wall of the housing. Internal structure also has significant differences. In particular, the "Plexi" bearing spindle table built directly into a plastic deck. All the differences can be seen by comparing the "Plexi" with more recent models in the pages of Minifon P55 L (1957) и  Minifon P55 L (1960). There you can read the other information on these recorders.
     Externally, the unit survived very well. Inside and everything was in place, not counting the fact that old age is completely destroyed and the rubber roller Belts fast. I already have a serviceable recorders Minifon P55 later versions, and this device, I initially decided not to rebuild. However, later on, making sure that repairs do not require major intervention in the original design, I decided to have it repaired. After lubrication mechanics, replacing rubber belt and rubber roller rewind machine is functioning well. 

Photos can be enlarged


In the photo at the bottom of the speed selector. Left switch in the increased speed for recording music, and the right-lapse recording speech.


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 P55-Speaker and Minifon Attache-Speaker


Rubber belt of old crumbled into dust, and was completely damaged tires on the roller rewind



Photographs taken during the repair.


The original batteries 12 v engine for recorders Minifon.



A set of original batteries for recorders Minifon P55



On the left the original mercury battery 1,4 v types Mallory Duracell ZM-9 (AA). In the photo on the right the original battery type 30 v Mallory RM-413, its modern equivalent Eveready 413, and a homemade battery 30 v, collected from three batteries MN (12 v + 12 v + 6 v).


Power supply 12 v to type recorders Minifon.


     Specification and wiring diagram Minifon P55. Photos from the book by Roland Shellin "Minifon Spy in your pocket", (Roland Schellin, "Minifon Der spion in der tasche"). In recorder Minifon P55 "Plexi" instead of radio tube XFY54 it is used XFY43.

Operating Instructions Minifon P55 (1955 - 1957)



Specification and price Minifon P55



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