Edward R Jahns

US Patent:

43455026, Aug 24, 1982

Filed:

Dec 26, 1979

Appl. No.:

6/107409

Inventors:

Edward R. Jahns - Fullerton CA

Assignee:

CBS Inc. - New York NY

International Classification:

G10H 102
H03F 326

US Classification:

84 121

Abstract:

The output section of a musical instrument performance amplifier comprises a pair of high impedance power field effect transistors connected to an output transformer to provide a relatively low push-pull drain load that effectively presents a high impedance constant current source to a loudspeaker. The amplifier, having such high impedance constant current source output, amplifies and sustains instrument sound, provides large amounts of power to the speaker over a wide range of speaker impedances, and enables production of high power harmonics.

US Patent:

39734617, Aug 10, 1976

Filed:

Aug 15, 1974

Appl. No.:

5/497820

Inventors:

Edward R. Jahns - Fullerton CA

Assignee:

CBS Inc. - New York NY

International Classification:

G10H 102

US Classification:

84 124

Abstract:

A selective distortion control circuit for an electrical musical instrument employs a cathode or emitter follower valve having a load resistance that is selectively changed to provide either a clean or distorted output signal. The mutually in-phase clean input and distorted output of the valve are connected to opposite sides of a potentiometer of which the wiper provides a selectively proportioned mixture of clean and distorted signals. The relative amount of distortion may be selected, and once selected, the operator may readily choose between clean and distorted sound by changing the load resistance.