Sorry, this page is not translated yet. Automatic translation used.
The radio battery SG-6 from 1930 to 1932 produced the Leningrad plant them. Kozitsky. The '' SG-6 '' radio receiver (6-tube Super Heterodyne) is intended for receiving on a framework antenna and a loudspeaker of broadcasting stations in the range from 260 to 1850 m (1154 ... 162 kHz). The first ST-6 lamp (dual-grid) serves simultaneously as a generator of local vibrations and as the first detector. The following three lamps of the ПТ-2 type serve to amplify the intermediate frequency oscillations obtained after the first detector. The fifth lamp PT-2 works as a second detector, the sixth lamp PT-2 amplifies the low frequency. A variable capacitor is switched between the control grid and the cathode of this lamp to adjust the contour of the loop antenna included in the control grid circuit of the two-grid ST-6 lamp. The local oscillator of the receiver is assembled according to the three-point scheme. The cathode grid of the ST-6 lamp was used as the control grid of the heterodyne. The tuning of the local oscillator is performed using a variable capacitor and by switching 2 sets of inductors. Reception volume is regulated by a capacitor. The transition from the first detector to the first cascade gain amplifier from the first cascade to the second cascade and from the second to the third cascade of the intermediate frequency amplifier was performed using transformers. The primary and secondary windings of the first IF transformer are tuned to a fixed constant frequency. In other transformers only secondary (grid) windings are tuned to the same frequency. The transition to the lamp of the second detector is rheostatic and from the second detector to the LF amplification stage - transformer. For power supply you need a battery with a voltage of 4-5 V and an anode battery with a voltage of 80 or 160 V. In the latter case, a grid bias battery is required. Increased anode voltage and bias are fed only to the LF gain lamp. Despite the significant number of lamps and the superheterodyne circuit, the sensitivity of the SG-6 radio receiver is not very high. Dimensions of the receiver 484x302x255 mm, weight 4.3 kg.