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公开(公告)号：US5343159A
公开(公告)日：1994-08-30
申请号：US17764
申请日：1993-02-16
申请人： Brent K. Butler
发明人： Brent K. Butler
摘要： The direct coupled solid state-vacuum tube hybrid circuit matches a high impedance audio source to a low impedance audio destination. The resulting device supplies essentially unit gain and has both single ended and balanced outputs. The solid state operational amplifier and vacuum tube devices are DC coupled and supplied from a common low voltage DC power supply. The vacuum tube is incorporated directly in the feedback loop of the operational amplifier and a suitably chosen dampening resistor allows the circuit to provide vacuum tube characteristic warming effects without unwanted distortion or tube microphonics.
摘要翻译： 直接耦合的固态真空管混合电路将高阻抗音频源匹配到低阻抗音频目的地。 所产生的器件基本上提供单位增益，并具有单端和平衡输出。 固态运算放大器和真空管装置是直流耦合的，并由普通的低压直流电源提供。 真空管直接结合在运算放大器的反馈回路中，并且适当选择的阻尼电阻器允许电路提供真空管特征的加温效果而无需不必要的失真或管道麦克风。
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公开(公告)号：US5705950A
公开(公告)日：1998-01-06
申请号：US601758
申请日：1996-02-15
申请人： Brent K. Butler
发明人： Brent K. Butler
摘要： In this hybrid amplifier circuit the vacuum tube is direct coupled or DC coupled to the output of a solid state amplifier in a cathode follower configuration. An automatically operative bypass component, such as a Zener diode, LED, transistor junction or relay, diverts the signal output of the solid state amplifier around the vacuum tube stage when bias conditions or other vacuum tube operating conditions signify that the vacuum tube is still warming up or for some reason inoperative. Thus the hybrid circuit produces amplification at full volume and at low distortion even while the vacuum tube is warming up. The vacuum tube provides a desirable warming coloration to the sound that may be user adjusted by controlling the level of closed loop feedback within the circuit. Lower total harmonic distortion is achieved in a pentode vacuum tube device by direct coupling the screen and control grids. Lower voltage use of power pentodes wired in nonconventional "triode mode" is achieved.
摘要翻译： 在该混合放大器电路中，真空管直接耦合或直流耦合到阴极跟随器配置中的固态放大器的输出端。 当偏置条件或其他真空管工作条件表示真空管仍然变暖时，诸如齐纳二极管，LED，晶体管结或继电器之类的自动操作旁路部件会将固态放大器的信号输出转向真空管级 或由于某种原因不起作用。 因此，混合电路即使在真空管正在升温时也以全体积和低失真产生放大。 真空管提供对声音的期望的加热着色，其可以通过控制电路内的闭环反馈的水平而被用户调整。 通过直接耦合屏幕和控制网格，在五极管真空管装置中实现较低的总谐波失真。 实现了以非常规“三极管模式”连接的功率五极管的较低电压使用。
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3.发明授权
公开(公告)号：US5022305A
公开(公告)日：1991-06-11
申请号：US340858
申请日：1989-04-20
申请人： Brent K. Butler
发明人： Brent K. Butler
摘要： The distortion pedal for electric guitar and other electronic musical instruments employs vacuum tube circuitry operated by low voltage "battery eliminator" DC power supply. A pull-up resistor biasing circuit on the vacuum tube grid improves input and output impedance and circuit headroom while providing good control over the harmonic content and sustain.
摘要翻译： 电吉他和其他电子乐器的失真踏板采用由低电压“电池消除器”直流电源操作的真空管电路。 真空管栅极上的上拉电阻偏置电路提高输入和输出阻抗和电路余量，同时提供对谐波含量和维持的良好控制。
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公开(公告)号：US06507240B2
公开(公告)日：2003-01-14
申请号：US09780052
申请日：2001-02-09
申请人： Brent K. Butler
发明人： Brent K. Butler
IPC分类号： H03F500
CPC分类号： H03F1/327 , H03F3/3069
摘要： A musical amplifier that includes a vacuum tube and a transistor. The vacuum tube is connected to the gate of the transistor, so that the current flow through the transistor is controlled by the vacuum tube. According to one example of the invention, the vacuum tube-transistor arrangement is set up in a “push-pull” arrangement, where a vacuum tube-transistor combination controls positive voltages, and another vacuum tube-transistor combination controls the negative voltages delivered by the system, the system output being at approximately zero voltage when not under load. Also, the use of the “Edison effect,” referred to as “thermionic emission” from vacuum tubes to variably regulate output transistor bias current resulting in substantially reduced total harmonic distortion is also disclosed.
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公开(公告)号：US4987381A
公开(公告)日：1991-01-22
申请号：US422738
申请日：1989-10-17
申请人： Brent K. Butler
发明人： Brent K. Butler
CPC分类号： H03F3/3001 , H03F1/3217 , H03F1/327 , H03F2200/516
摘要： A closed loop bipolar transistor driver is coupled to an open loop MOSFET output stage. The closed loop driver amplifier operates within a higher voltage range than the open loop MOSFET output amplifier. The closed loop driver stage is capable of driving the MOSFET output stage into saturation and the MOSFET output stage thereby produces a desirable vacuum tube-like sound characterized by warm, even harmonics. Feedback is used to maintain the closed loop driver circuit in a linear operating regime thereby preventing undesirable hard clipping associated with bipolar transistors when they are overdriven.
摘要翻译： 闭环双极晶体管驱动器耦合到开环MOSFET输出级。 闭环驱动放大器在比开环MOSFET输出放大器更高的电压范围内工作。 闭环驱动级能够将MOSFET输出级驱动到饱和状态，并且MOSFET输出级由此产生期望的真空管状声，其特征在于温暖均匀的谐波。 反馈用于将闭环驱动器电路维持在线性操作状态，从而防止当双极晶体管过驱时与双极晶体管相关联的不期望的硬限幅。
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