Vacuum tube audio amplifying circuit

Details Vacuum tube audio amplifying circuit Vacuum tube audio amplifying circuit

1997-10-27

1999-06-15

Pascal, Robert

Amplifiers

Including a push-pull stage

330 3, 330150, H03F 328, H03F 500, H03F 122

Patent

active

059125853

ABSTRACT:
In a direct coupled type vacuum tube amplifying circuit, to stabilize the operation and simplify the feedback loop, a plate power source EB5 is connected to a plate of a vacuum tube V5 of a first stage through a constant current source 1. A grid of a vacuum tube V6 of a next stage is connected to the plate of the vacuum tube V5 through a first resistance R3. A second resistance R4 is connected between the grid and the cathode of the vacuum tube V6. A negative power source EC6 is connected to the resistance R4 through a constant current source 2. In this constitution, the grid bias voltage of the second vacuum tube V6 is defined by the voltage drop of the second resistance R4.

REFERENCES:
patent: 2257782 (1941-10-01), Boucke
patent: 2716162 (1955-08-01), Pearlman

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