The special recorder "The Bat" has been produced by the Kiev Scientific Research Institute MARS (formerly named after Manuilsky) since 1971. On the site http://vintage-technics.ru/ from where the photos and information of the recorder is referred to as "Spy", that is, without a name. One of my friends immediately called him "The Bat", since in his youth, or rather, in January 1972, he saw such a voice recorder at work. Perhaps it is not, but let it be "Bat." Here is the description of the author of the site where the photo and info came from: The recorder has dimensions 138x90x17 mm and weighs 380 grams. Structurally, the device is designed as a military device. The body - the chassis is milled from a single block of some kind of alloy, possibly titanium. The top and bottom covers are aluminum. The top cover has a round window for visual control of the rotation of the receiving coil. In the middle of the cover is its latch. To open the lid, press the button on the side. In this case, the latch is released, and the cover is easily removed. The speed of the tape is stabilized, there is a caper and tonrolik. However, in this design, the rubber coating has a capstan, and not a trolley, as is customary. It would be more correct to say that I received this recorder in such an arrangement, but this does not mean that it was so. This is probably the result of repair, modernization. In the future, I redid everything according to the classical scheme with a rubber key capstan. Only in this form was it possible to achieve acceptable uniformity of belt movement. However, I didn"™t redo the photos, and the toned tires are rubberized on them. The miniature engine is located horizontally and the movement from it to the flywheel is transmitted using the belt. The clamps of the tape with the felt lining and the brass tonroller are fed when the lever with the red knob is turned. In this case, the conical nozzle of the flywheel shaft is pressed against the rubberized roller of the capstan, which is connected to the winding unit through an intermediate rubberized roller. In general, the design looks well thought out, and is made at a high technological level. The workmanship of all parts, even the smallest, is very high.There is a hitchhiking. For its operation, one of the guide posts is used, located next to the flywheel. This rack is isolated from the case, and is closed on it with a metal tape glued at both ends of the winding coils. In this case, the control circuit turns off the power to the device. The dictaphone uses a magnetic tape of standard width of 6.35 mm on metal coils with a diameter of 53 mm. Depending on the thickness of the film, you can make 1 ... 2 hours of recording (per track) per reel. After that, the coil can be flipped, and continue recording on the second track. For fixing the coils on the reel tables, there are round twisted springs, and in the coils themselves there are corresponding grooves. Included with the reels are plastic adapters for listening to records on a conventional tape recorder. Rewinding in the recorder is not provided, but for its implementation there is a special attachment with a gearbox. It is put on top of the corresponding coil and rewind is performed manually using a rotating handle. In this case, the guide pin of the device is inserted into the hole for the latch of the top cover of the voice recorder. By rearranging the device as desired, you can quickly rewind the tape in both directions. Also included is a simple device for rewinding in the form of a plastic handle with three pins on the end. Both heads, universal and erasable, are made apparently for this model, and have dimensions of 10x10x8.5 mm. The power supply of the recorder is 4.8 V, carried out from 4 batteries of the type "DEAC" or D-0.1. To use D-0.1 batteries, ebony adapters of the appropriate diameter are inserted into the battery compartment. The current consumption when recording 35 mA, when playing 40 mA. On the front side of the recorder are two connectors. One, located in the middle, is designed to connect a remote switch, and the second to connect a microphone, and an external playback amplifier. The connector for the switch has a rotary lock, and for connecting a microphone and an external amplifier, a round five-pole connector with a thread is used.If you remove the bottom cover, you gain access to the internal wiring and electronics boards. Three electronics boards and wiring are located in the milled grooves and voids of the monolithic case. For wiring used wire type MGT in fluoroplastic insulation. Apparently, next to the connectors is the control circuit board recording modes - play - autostop, and the stabilizer of the engine speed. Since there is no mode switch, the control circuit switches between modes, depending on what is connected, a microphone, or an external playback amplifier. In the opposite side of the case, there are recording amplifier boards and an erase generator. All boards are coated with a protective varnish. The recorder is turned on using a remote switch - a button. Included are two such switches with wires of different lengths, and one without wires at all, combined with a connector. To turn on the voice recorder, press the button, and to turn it off, pull it back. The external playback amplifier is made in the form of an aluminum box with the size of 73x36x16 mm, weighs 50 grams and is assembled on 6 transistors. It has two parallel output connectors for headphones or external devices. Power to the amplifier is supplied from the recorder, which explains the fact that the current consumption during playback (40 mA) is greater than during recording. Also included is a device for quickly demagnetizing Lena (the entire coil at once), a battery charger, an oiler, and miniature canisters with spare cogs and tape for gluing tape. There is some metal tape for hitchhiking. Microphones have dimensions of 30x11 mm and weigh 25 grams. On their reverse side there are pins for attaching to clothes.