Construction of a hybrid cascade. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / RF power amplifiers
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In amateur communication KB equipment, hybrid stages are often used with the inclusion of a transistor in the cathode of the output lamp of the transceiver. But what if the cathode of the lamp is connected to a filament or a direct incandescent lamp is used? A possible option for building a hybrid cascade with GI-7B, GK-71 (VL1) lamps is shown in the figure.
A three-winding choke-transformer is included in their heating circuit. A transistor is connected to one of its windings, for example. KT907, KT904.
The incandescent inductor-transformer is wound on an annular (with an outer diameter of 32-65 mm) magnetic circuit, for example, made of 50VCh ferrite with a PEV-2 wire with a diameter of 1,25 ... 1,3 mm. The number of turns is 8-12. Winding is carried out simultaneously with three wires.
Author: V. Shuklin (U3WP), Kursk; Publication: N. Bolshakov, rf.atnn.ru
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