Audio frequency power amplifier with improved circuit topology

Details Audio frequency power amplifier with improved circuit topology Audio frequency power amplifier with improved circuit topology

1989-03-23

1990-04-17

Mottola, Steven

Amplifiers

With plural diverse-type amplifying devices

330 97, 330118, H03F 500

Patent

active

049183940

ABSTRACT:
The present invention is an audio frequency power amplifier input circuit having improved vacuum tube circuit topology. The improved circuit includes a direct current feedback circuit within the input circuitry which stabilizes the operating point of a phase inverter. The feedback circuit maintains optimum operation of the circuit despite variations in tube characteristics or supply voltages. Another aspect of the improved circuit comprises a low impedance phase inverter which improves the drive capability of the phase inverter to push-pull power output vacuum-tube grids.

REFERENCES:
patent: 3094673 (1963-06-01), Maupin
Horowitz, "Phase Inverters for Hi-Fi Amplifiers," Radio & TV News, May, 1957, pp. 92-97.
Hafler, "120 Watts of Hi-Fi Power," Radio & TV News, Feb., 1959, pp. 118-120.
Hafler, "A 60-Watt Ultra Linear Amplifier," Radio & Television News, Feb., 1955, pp. 45-et seq.
Peters, "In Defense of the Split-Load Phase Inverter," Radio -TV News, Nov., 1957, pp. 182-184.
M. Joyce and K. Clarke, Transistor Circuit Analysis, pp. 52-61.
Radiotron Designer's Handbook (2 Langford-Smith ed. 1953), pp. 328-330, 533-534.
Photofact Folder, showing David Bogen Model K030 Amplifier.
RCA Tube Manual (1970 ed.), p. 607.

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