Solid state circuit for emulating tube compression effect

Details Solid state circuit for emulating tube compression effect Solid state circuit for emulating tube compression effect

1994-01-18

1996-06-04

Brinich, Stephen

Electrical audio signal processing systems and devices

Sound effects

H03G 308

Patent

active

055240550

ABSTRACT:
A solid state amplifier for emulating the compression associated with an overbiased class-B push-pull tube amplifier at high input signal levels due to the flow of current into the grid of the output tubes resulting in a desirable output clipping characteristic with crossover distortion is disclosed. The invention includes at least one pair of class-B connected solid state devices, each having an input circuit and an output circuit. The output circuits are connected for mixing. A biasing element in the input circuit of each paired solid state device establishes a clipping level offset at the input circuit and at the output circuit of each device. A clipping element in the input circuit and the output circuit clips the offset at the input circuit and clips the offset at the output circuit of each respective solid state device. A charging element overbiases the offset in the input circuit whenever the input signal is greater than the input clipping element. The overbiasing causes crossover distortion for emulating the desirable compression associated with a tube amplifier.

REFERENCES:
patent: 4405832 (1983-09-01), Sondermeyer
patent: 4439742 (1984-03-01), Sondermeyer
patent: 4809336 (1989-02-01), Pritchard
patent: 4937847 (1990-06-01), Kruger
patent: 4987381 (1991-01-01), Butler
patent: 4995084 (1991-02-01), Pritchard
patent: 5012199 (1991-04-01), McKale
patent: 5133014 (1992-07-01), Pritchard

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