Single-tube stereo power amplifier circuit composed of 6C6B

The figure below shows a single-tube stereo low-power amplifier, with V1 and V2 acting as left and right channel amplifiers respectively, and outputting 100mW audio power from output transformers B1 and 82 respectively to drive a pair of 32Ω stereo headphones Rj to play sound. The power supply is a DC power supply. A battery Ea is a 6V 10Ah lead-acid battery, which powers the filament; B battery Eb is 34 3.6V 2.6Ah lithium batteries connected in series to form 122V, which powers the screen. A single charge can play sound continuously for 24 hours.

The output transformers B1 and B2 are made by winding 2240 turns of φ0.1mm enameled wire on the primary side and 180 turns of φ0.16mm enameled wire on the secondary side. The core tongue is 1.5cm wide and 2.0cm thick. The core is E1 type silicon steel sheet. The core is inserted in the same direction. A layer of 0.1mm thick cable paper is placed at the magnetic gap.

Production of power transformer DB: The primary winding is wound with 0.13mm enameled wire for 2640 turns, the secondary high voltage system is wound with φ0.13mm enameled wire for 1560 turns, and the filament winding is wound with φ0.69mm enameled wire for 80 turns. The core tongue is 2.0cm wide, 2.4cm thick, and E1 type silicon steel sheet.