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Since 1939, the tube network radio "4N-1" has prepared the Kiev Radio Plant for production. Here is what is written about the radio receiver in magazine "Radio Front" No. 14 for 1939. The Kiev Radio Factory is conducting preparatory work for the production of tube radio receivers. The first will be mastered receiver type "SI-235". Although the circuit diagram and a set of lamps are preserved in it, but at the same time changes are made: the capacitors with a solid dielectric circuit will be replaced by an assembly of air-insulated capacitors, the box, the location of individual parts, and more are changed. The brand name of the receiver is "4H-1". The All-Union Radio Committee gave its consent to the organization of the production of receivers at the Kiev Radio Plant and allowed the release of receivers of the type "SI-235" until the end of 1939. By 1940, the plant should prepare the release of a more modern receiver on metal series lamps. It is possible that the button receiver, developed by IRPA on the instructions of the WRC, will be accepted for production. In parallel with the production of receivers "4H-1", the production of spare parts for it, in particular power transformers, will be organized. At the same time, the plant prepared for release an aggregate of variable capacitors with a vernier, of American type, used in the receiver '' 6H-1 ''. Below page from the magazine "Radio Front" No. 14 for 1939.