Sorry, this page is not translated yet. Automatic translation used.
The radio battery type "BT" since 1926 produced the Moscow Telegraph Plant, the Moselektrik Plant and the Kozitsky Leningrad Plant. "BT" is the development of Borusevich"™s engineer, Three-Lamp. "BT" is a regenerative radio receiver with high-frequency amplification cascade, detector and low-frequency amplification cascade. By design, it is similar to the high-frequency receiver with one amplification cascade at low frequencies instead of two. 300 ... 1800 m. The radio receiver is mounted in a wooden box made in the form of a remote control panel. The antenna circuit is continuously tuned with a variometer, the grid circuit of the detector lamp is a variable capacitor with an electric vernier. The anode coil of the first lamp and the grid coil are second The lamps are sectioned. In addition, using a contact switch, you can plug capacitors of different sizes in parallel or in series into the antenna. There is a transformer booster amplifier. You can listen to the first two lamps, including the telephone parallel to the primary winding of the bass transformer. !). A big disadvantage is the total resistor for all the lamps. It gives the possibility of receiving allied and foreign stations, some of them to the loudspeaker (for example, the Record type), some to the telephone. Gives confident reception of powerful stations on the loudspeaker at a distance of 300 km. Receiver price 87 rubles. 72 kopecks