Amplifiers – Signal feedback – At least one push-pull signal stage
Patent
1996-01-22
1997-02-18
Mottola, Steven
Amplifiers
Signal feedback
At least one push-pull signal stage
330 82, H03F 136, H03F 328
Patent
active
056044615
ABSTRACT:
An audio amplifier including a series connected vacuum tube output stage for driving an audio loudspeaker. The preferred amplifier uses the output signal as a floating reference for an intermediate stage to prevent output stage degeneration for producing balanced push-pull drive signals, thereby eliminating the need for an output transformer or AC coupling.
REFERENCES:
patent: 2773136 (1956-12-01), Futterman
patent: 2802907 (1957-08-01), Peterson et al.
patent: 3123780 (1964-03-01), Futterman
Amemiya, Hiroshi: An Output Transformerless Amplifier, Journal of the AES, Apr., 1956.
Amemiya, Hiroshi: Analysis of Drivers for Single-Ended Push-Pull Stage, I.R.E. Trans. on Audio, Sept.-Oct., 1955.
Peterson and Sinclair: A Single-Ended Push-Pull Audio Amplifier, Proc. I.R.E., Jan., 1952.
Futterman, Julius: Practical Commercial Output Transformerless Amplifier, Journal of the A.E.S., Oct., 1956.
Futterman, Julius: An Output-Transformerless Power Amplifier, Journal of the A.E.S., Oct., 1954.
Onder, K.: A New Transformerless Amplifier Circuit, Journal of the A.E.S., Oct., 1953.
Brociner and Shirley: The OTL Amplifier, Audio Engineering, Jun., 1952.
Unknown Output Transformerless Amplifiers, Wireless World, Feb., 1957.
Dickie and Macovski: A Transformerless 25-Watt Amplifier, Audio, Jun., 1954 .
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