Audio recorders

Aiwa TP-30

Aiwa TP-60R

Andy Gard Recorder

Answer ATR-102

Apolec RA-11


Assmann TS 10

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Crown CTD-2200

Dictaphone Dictet

Dictaphone 4250

Dictaphone model 848

Dictaphone "OMEGA"

Dictophone KGB "Sobesednik"

Dokorder PT-4H

EDI model M-75B

Edison Envoy Model 1

Electron 52D

Electronica M-401S

Electronica M-402S

Electronica M327

Emerson Wondergram


Fanon-Masco FTR-2

Fi-Cord 1A

Fi-Cord 101S

Fi-Cord 303

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Gray Audograph D6

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Grundig Stenorette 2000

Globe-Corder GT-101

IBM 224 Dictating Unit

Juliette LT-44

Lanier VIP/C

Lloyd's 8 track player


Memocord K60

Memocord mini K177



Minifon Mi51

Minifon Attache

Minifon Attache-Speaker

Minifon Hi-Fi

Minifon Liliput

Minifon Protona Special

Minifon P55 "Plexi"

Minifon P55 L (1957)

Minifon P55 L (1960)

Minifon P55-Speaker

Minifon_wrist watch_mic

Mohawk Midgetape 44

Mohawk Midgetape 300

Mohawk Midgetape 400



MS-61 - Flight Recorder

National RQ-8100

Norelco LFH 0085/54

Norelco LFH 0095

Olympia DG 402

Olympus Pearlcorder L200

Panasonic RQ-115

Panasonic RQ-212DKS

Panasonic RQ-SX56

Panasonic RQ-SX97F

Philips EL 3302

Phono TRIX 88

Playtape 1200

Pocket Corder MC-2

Reporter 5

Ross Mark-55

Sanyo Micro-Pack 35

Sanyo M2580K

Sony BM-17 Dictator

Sony TC-5

Sound Machine "Hokie Pokie"


SoundScriber 200

SoundScriber 200 B

Sputnik 401

Spy Tape Recorder

Steelman Transitape

Stenotape TR-711

Stuzzi Memocord 304 B

Tefifon Holiday BK-59

Telefunken 600

Telmar T-100


Topaz D202



Яхта-1М (Yacht)/Явiр-1



Televisions, video

Akai VT-150

Akai VC-150


Electronica-video VMP-1



Electronica L1-08

Panasonic TR-1030P

Sony AV-3400

Sony AVC-3400

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Sony Watchman FD-30A

Sony Watchman FD-40A


Tube radios

Emerson 508

Motorola 56L2

RCA Victor 54B2

RCA Victor BP-10

Sterling LS-4

Tourist PMP-56

United Deluxe RN-5




Minifon_wrist watch_mic

Andy Gard Recorder

Olympia DG 402

Dictaphone Topaz D202

MS-61 - Flight Recorder


Other rarities

Detective Dictograph



Motorola M75

Pentacon six TL

Tube Tester I-177


V/A - Meters

First transistors USSR


My works

Tube stereo cassette player

Tube Microcassette recorder

Tube "Electron 52D"






RussianAudio recorders Televisions, video Tube radios NEW Other rarities My works


Minifon Protona Special



Used Google translator

    Minifon Protona Special.   This is one of the later models in the series of wire recorders Minifon. They were produced from 1960 to 1965. From 1960 to 1962, their company produced "Protona GmbH"; Hamburg, and from 1962 to 1965, after the merger - "Telefunken", Germany. In the first 50 years also produced models P55 and Mi51, and their electronics was still a tube. Both these models are collected on 3-miniature vacuum tube, and for their work required 3 batteries. 12 v to power the motor, 30 v - the anode voltage, and the 1,5 v - glow lamp.
    Minifon Protona Special, which I represent, made in 1962, has 6 transistors, and is powered by a battery. It makes me wonder. Precision mechanics performed a technically flawless, and after the repair works like a clock. Block heads during the move up - down uniformly laying wire on the coil. See how it works, have fun. Dimensions recorder 177 x 102 x 42 mm. Weight 800 g. Coil diameter 44 mm accommodate the volume of a special wire with a diameter 0,038 mm, sufficient to work for 5 hours at a speed of 23 cm / sec (model L). Also used the wire diameter 0,05 mm. For these recorders and the other was a standard rate - 34 cm / sec (model S). Nutrition 12 v. Batteries required size, as I understand, made specifically for this series recorders. In the kinematics used engine with electronic speed stabilization. The active elements of the stabilizer are the transistor and the light bulbs. Movement of the engine is transmitted through belt a cylindrical flywheel axis of rotation which is horizontal. Further work shaft rollers and a system of gears. Unlike other portable recorders that time, there is 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. The solution is simple and original works flawlessly. As an indicator of hitch is used, the red light bulbs, located above the miniature needle indicator of the supply voltage. Block heads made in the nonseparable case with a guide groove for the wire, and has special springs to prevent her jumping down. During the head moves up - down uniformly laying wire on the coil. This motion is realized through a system of gears. Four keys, - "stop", "rewind", "play back", and "record" are made from high quality plastic and are arranged in a row. Above them is counter flow wire. To the left of them, jack for external power supply, and the right connector for microphone and headphones. No built-in speaker. On the flip lid case recorder glued brief instruction manual in English. Housing cast, made of durable magnesium alloy. For recorders in this series were issued special spy accessories, such as a microphone, under the camouflage watches, a device for recording telephone conversations, a miniature microphone with a clip, and others.
     Know that in Germany, these recorders are sold for 925 DM (model S), and 985 DM (model L), which was at that time large sums. All models Minifon were very popular, used by special services, and successfully sold in 80 countries.
     The device has got me in the hands of a very long time, and I repaired it then improvised means. Therefore, the photographs can be seen on the modern, including domestic radio components. For example, instead of the visible LED indicator lamp. Also replaced belt and tires on one of the rollers. Now the recorder is in working condition, but I plan to find a family details, and put everything in their original condition.

Video review

After 1962, in the United States on the label in the box between "minifon" and "special" could be placed logo "ITT". Photos can be enlarged


Photographs taken during the repair

On the left the original batteries 12 v. On the right hand-made battery 12 v.

Microphone to the recorder Minifon Protona Special, Minifon Attache, and Minifon Hi-Fi.

Power supply 12 v to type recorders Minifon.

Coils of wire

Block heads to the wire recorders Minifon Protona Special and Minifon P55

     Electrical circuit and technical parameters Minifon Special. Photo from the book by Roland Shellin "Minifon Spy in the pocket", (Roland Schellin, "Minifon Der spion in der tasche"). It is seen that in the scheme may be 4 or 5 types of transistors, OC304, OC307, depending on the modification. However, in my recorder to 6, with a different type (OC75). The amplifier is built on four transistors, one used in the stabilizer speed motor, and another as a protection diode on power supply.

Description of the Minifon Special in the Telefunken catalog

Microphone, clock-clad "Minifon", and advertising similar watches "Lafayette"


Minifon Liliput

     There is no such recorder in my collection, but since this model is outstanding, I decided to post here the information I know about it.
     In 1958 - 1959, a prototype of the Minifon Liliput recorder, even smaller than the previous Minifon models, was designed. It weighs 500 grams, dimensions 136 x 87 x 43 mm, food, 8 - 10,5 v battery from a compact Mini-accu. There were options for wiring 3 and 4 transistors. In a series of model unfortunately did not go, and at auctions, I have not seen it yet. A total of about 10 copies were produced. Now it is known that two of them are in private collections, and two more are in the museum storage.  A photo of the recorder is placed on the cover of the book by Roland Shellin "Minifon The Spy in Your Pocket", (Roland Schellin, "Minifon Der spion in der tasche"). In this book of 200 pages of detailed history and construction of all models Minifon with plenty of photos.

Also Roland Schellin shared with me several photos of Minifon Liliput, which show details of his design

The kinematics of the recorder are largely borrowed from previous Minifon models. It is interesting that in this small design even the meter of wire consumption has been placed



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