A simple LF amplifier on lamps. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Tube Power Amplifiers
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A schematic diagram of a simple tube low-frequency amplifier that can be used as a final amplifier is shown in the figure.
Despite the fact that the circuit of this amplifier is not particularly complex, its parameters deserve respect.
The output transformer of the amplifier is wound on an EIXX core. The primary winding has 2x800 turns of wire with a diameter of 0,25 to 0,3 mm. The secondary winding for a load with a resistance of 4 ohms has 48 turns, for a load with a resistance of 8 ohms - 65 turns, and for a load with a resistance of 16 ohms - 90 turns of varnished copper wire with a diameter of 1 to 1,2 mm.
Setting up the amplifier does not cause much trouble. Trimmer potentiometers 1 MΩ on the cathodes of the lamps must be set to a voltage of 0,125 V, which ensures the symmetry of the output signal. This completes the adjustment process.
The chassis with the amplifier can be placed in the body of a full-range speaker system, i.e. to make the so-called COMBO unit, that is, an electro-acoustic unit consisting of an acoustic system and a bass amplifier placed in its case. Such a device can be used for home rehearsals, for listening, or for feeding a signal through a microphone to a mixing console.
See other articles Section Tube Power Amplifiers.
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