Portable wire recorder "Meson".

Reel-to-reel tape recorders, portable.Reel-to-reel tape recorders, portableThe portable wire recorder "Meson" was produced presumably from 1960 (I think later) to 1987 for the special services and the Ministry of Internal Affairs. The dimensions of the device are 158x75x26 mm. Weight without power supply 500 g. The wire on the reel is enough for 1.5 hours of recording. Coil dimensions 35x12 mm. The rewind time is 1 hour. 7 V power supply from BOR battery, OR-2K (RC-63) cells, DEAC batteries or 5 Saturn cells placed in an external container. Power can be supplied from an external source through an adapter that fits into the battery compartment. Recording is carried out by a Neva or T-65 microphone, TM-2 earphone, or from an adapter. Listening to the recording is carried out by the TM-2 earphone or external ULF. There is a connector marked "M" for connecting a microphone, earphone and adapter. The other two connectors are for the remote control switch. Plugs are threaded to prevent accidental popping out. The voice recorder is controlled by a switch, which is in the "Stop" position, which is marked on the case cover with a blue circle, when it is inoperative. When you switch the switch to the position marked with a red circle, and with the top cover closed, recording is performed, and when open, playback. The wire is rewound when the cover is open and the switch is turned clockwise until it stops. The circuit is assembled on five transistors. To reduce interference, the amplifier unit is placed in a permalloy screen. Connectors, a motor control circuit and a bias generator are assembled on a board located at the end of the case. There is a 3-position attenuator for volume control and recording. There is no erasing head, erasing is carried out by an external demagnetizing choke. The belt transmits movement from the engine to the horizontal flywheel, which in turn rotates one of the two rubberized faceplates, depending on the operating mode. The universal head moves up and down using a worm gear. There is an auto-stop that is triggered when the wire runs out on the feed spool. At the same time, a spring-loaded lever held by turns of wire is released on the feed spool and presses the hitch-stop lever located under the feed spool. The latter opens the contacts of the motor circuit. The kit has the necessary set of accessories, such as additional coils, including a wire, a power adapter, an adapter for recording from an external source, an adapter for contactless recording from a telephone line, a demagnetizing choke, a BOR battery, OR-2K cell cups (RC- 63), TM-2 earphone, grease tube, wire threading device.