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1. 发明专利

JPH09199947A HEATER GROUNDING CIRCUIT FOR DIRECT HEATED VACUUM TUBE EMPLOYING DIODES 失效
公开(公告)号：JPH09199947A
公开(公告)日：1997-07-31
申请号：JP3257796
申请日：1996-01-11
申请人： KUDO SUEZO
发明人： KUDO SUEZO
IPC分类号： H01J19/78 , H03F1/00
摘要： PROBLEM TO BE SOLVED: To suppress the reduction in the gain through the use of a hum balancer in an amplifier with a direct heated cathode by a direct current and a fixes bias. SOLUTION: A direct heated cathode vacuum tube is heated by a DC, the cathode of a diode 1 is connected to a negative terminal of a heater, a negative pole of the heater, and an anode of a diode 2 and an anode of the diode 1 connects to ground. The cathode of the diode 2 connects to a negative power supply terminal of a hum balancer 4. An anode of a diode 3 connects to a positive terminal of the heater, the cathode of the diode 3 connects to a positive power supply terminal of the hum balancer 4 and a positive power supply of the heater. A center tap of the hum balancer 4 connects to ground.

2. 发明专利

JP2000350283A COUNTER ELECTROMOTIVE FORCE INTERFERENCE PREVENTING CIRCUIT 失效
公开(公告)号：JP2000350283A
公开(公告)日：2000-12-15
申请号：JP19643699
申请日：1999-06-07
申请人： KUDO SUEZO
发明人： KUDO SUEZO
IPC分类号： H04R3/02 , G05F3/04
摘要： PROBLEM TO BE SOLVED: To provide a counter electromotive force interference preventing circuit using a diode for AC power amplification faithful to an input. SOLUTION: The cathode of a diode 1 is connected to a power source B and the anode is connected to a terminal B of an output transformer 3. The cathode of a diode 2 is connected to the power source B and the anode is connected to a terminal B of an output transformer 4. Through the operation of this circuit, a counter electromotive force generated by a loudspeaker which is the load of the output transformer 3 appears even on the primary side of the output transformer 3, but is cut off by the diode 1 to exert no influence on a power circuit. A counter electromotive force generated by a loudspeaker, the load of the transformer 4, on the other hand, appears even on the primary side of the output transformer 4, but is cut off through the operation of the diode 3 to exert no influence on the power circuit. Further, there is no inference between the counter electromotive forces.

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