Title:
【発明の名称】音声用真空管増幅回路
Document Type and Number:
Japanese Patent JP2909019
Kind Code:
B2
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.
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Inventors:
YAMADA KAZUTOSHI
Application Number:
JP9595996A
Publication Date:
June 23, 1999
Filing Date:
March 25, 1996
Export Citation:
Assignee:
ZANDEN OODEIO SHISUTEMU JUGEN
International Classes:
H03F1/36; H03F3/02; H03F3/181; H03F3/28; H03F3/34; H03F5/00; (IPC1-7): H03F1/36; H03F3/02; H03F3/34
Domestic Patent References:
| JP62101107A | ||||
| JP58196705A | ||||
| JP63217807A | ||||
| JP7303015A |
Attorney, Agent or Firm:
Yoshiki Okamoto (1 person outside)