IBM 224 Dictating Unit

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     IBM 224 Dictating Unit.   Portable tape recorder (dictating machine) of the company IBM. This model was produced in 1965. Dimensions 154 x 119 x 46 mm. Weight 650 g. Power supply 10,7 v, special battery IBM (photo below). The device was intended for use in offices, namely, to record voice, followed by printing text on a typewriter. One of the requirements for such devices, was to repeat the last phrase. This recorder also has a switch that allows one-touch instant return to 6 seconds ago. It was very convenient for the typists, dictation printed texts. A feature of this design is an unusual type of storage media. This is not a tape in the usual sense, but all the same band width of 3 inches, stuck together in the form of a loop. Loop rotates cyclically at a constant speed, and the head is moved from one side to the other of using the worm mechanism, and writes on it a spiral track. Thus, for such a loop can only do 10 minutes of recording time, 100 head of passes, and 6 seconds to pass. Now you know how easy it is realized an immediate return to 6 seconds ago. Each time you press the corresponding key head simply shifted by a single pass. The design of the device is very tech. Engine with gearbox located inside the rotating drum loop. Worm head moving mechanism connected to the engine with a rubber belt worn by a gear motor shaft and the worm screw. Button connected with the pointer moves the head by hand to the right place. The pointer moves within the elongated window along the line replaceable paper - cards with markings on which you can make notes with the knob on the right of the window. Provides manual adjustment of the head the sound quality, what we now call tracking. On the front panel, a blue square box located volume control, switch LED battery charge, record button (middle), and the mode switch, stop - play - return to 6 seconds ago. Also on the front panel is the speaker. On one side panel is a microphone and connectors to connect an external microphone, charger, and external power supply. On the other side panel is plug the battery compartment, and a button to open the carriage head. In order to replace the magnetic loop, just press the catch on the bottom panel, and to nominate the entire structure of the body until it stops. Pressing the button on the side carriage release its lock, and she leans up under the action of the spring. In such a situation can be replaced by a magnetic loop and clean the head. When the proposed design, also opens access to adjust the recording level (record level guide). Quality good voice recording.
     I have two such recorder in working condition. On the details of one of them is dated '68, on the details of the second - '65. Their designs have minor differences , and electrical completely different . Wiring apparatus '68 collected 7 transistors having marking 639 (2 pcs.) , 593 , 638 , 640, 655 , and transistor radiator has no markings ( except the markings Tjapan 5). Wiring apparatus '65 collected 9 transistors. Three of them are marking 1134 646 VF02746D, 099 , 125, no markings on the rest . Electronics board apparatus '68 two-sided, one-sided board in '65.
     Devices have been bought complete with qualitative leather covers. Repair was reduced to preventive maintenance of mechanics and replacement drive a belt which has irrevocably collapsed from time. Unfortunately, it at me only one on two serviceable recorder.  

Video review

Strap with leather coffer can be removed and attached directly to the body of the recorder. Photos can be enlarged

If you open the oblong box, open access to the removable paper line and a pointer. The index is a miniature cartridge with two markers. If you turn the knob to the right of the line, forward or backward, the paper is pressed against the line of one of the handles, and it remains a point 

In the picture below on the left unit in 1968, right in 1965

On the left board electronics unit manufactured in 1968, right in 1965

Transistor heatsink recorder 1968

On the left sticker on the unit in 1968, pictured right in 1965

On the left - all that remains of the old drive belt. Pictured right sticker with brief instructions for the device in 1965

The photo on the left of the magnetic loop width of 3 inches.

In the battery compartment were rolled into a tube service sheets. At 10,7 v battery has dimensions of 25 x 80 mm and weighs 110 grams.

Information on IBM to start production of the model 224 in 1965, and advertising in the press for 1966