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Tetrode Tube
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Manley Labs Neo-Classic 250 Watt Monoblock Amplifier
List Price: $12,500.00
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Input sensitivity: 1V
Gain: 32dB tetrode; 30dB in triode
Input Impedance RCA: 116 Kohm @ 1KHz
Input Impedance XLR: 270Kohm @ 1KHz; 20Kohms @ 20KHz; 38Kohm @ 20Hz
Noise Floor: Tetrode: -67dB; Triode -65dB typical
S/N Ratio: -80 dB
Dynamic Range: 96dB
Flat frequency response: 10 Hz - 30 KHz continuous
Power Consumption: 30 Watts in "Ever-Warm"
Full power (tetrode): 500W
Full power (triode): 275W
Factory set for 100V, 120V or 220-240VAC operation for original destination country's mains voltage.
Operating Mains Voltage changeable with power transformer re-wiring and fuse value change.
Mains Voltage Frequency: 50~ 60Hz
Dims: W=19", D=13", H=9"
Shipping weight: 82 lbs. each
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Power Vacuum Tubes Handbook, Third Edition (Electronics Handbook Series)
List Price: $149.95
Sale Price: $128.67
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Providing examples of applications, Power Vacuum Tubes Handbook, Third Edition examines the underlying technology of each type of power vacuum tube device in common use today. The author presents basic principles, reports on new development efforts, and discusses implementation and maintenance considerations. Supporting mathematical equations and extensive technical illustrations and schematic diagrams help readers understand the material.Translate Principles into Specific Applications This one-stop reference is a hands-on guide for engineering personnel involved in the design, specification, installation, and maintenance of high-power equipment utilizing vacuum tubes. It offers a comprehensive look at the important area of high-frequency/high-power applications of microwave power devices, making it possible for general principles to be translated into specific applications. Coverage includes power grid tubes—triodes, tetrodes, and pentodes—as well as microwave power tubes such as klystrons, traveling wave tubes, gyrotrons, and other high-frequency devices. These vacuum tubes are used in applications from radio broadcasting to television, radar, satellite communications, and more. Explore a Wide Variety of Methods in Power Vacuum Tube Design This third edition includes updates on vacuum tube technology, devices, applications, design methods, and modulation methods. It also expands its scope to cover properties of materials and RF system maintenance and troubleshooting. Explaining difficult concepts and processes clearly, this handbook guides readers in the design and selection of a power vacuum tube-based system. What’s New in This Edition Includes two new chapters on properties of materials and RF system maintenance and troubleshooting Contains updates and additions in most chapters Identifies key applications for commercial and scientific research Examines the frontiers of materials science directly impacting construction, reliability, and performance Reviews methods of power tube design for more efficient, longer-lasting tubes Features updated illustrations throughout to clarify and explain fundamental principles and implementation considerations
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Power Vacuum Tubes Handbook, Second Edition (Electronics Handbook Series)
List Price: $199.95
Sale Price: $162.40
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Providing examples of applications, this handbook examines the underlying technology of each type of power vacuum tube device in common use today. The author reports on new development efforts and explains the benefits of specific work. Basic principles are discussed, and supporting mathematics are included to clarify the material presented. Extensive technical illustrations and schematic diagrams aid the reader in understanding the maxims of the subject.What's New in the Second Edition?Reviews the latest in new vacuum tube technology - new devices and refinements of existing devices that extend power and frequency capabilitiesIdentifies new applications for commercial and scientific researchExamines new frontiers on materials science - directly impacting construction, reliability, and performanceOutlines new methods of power tube design - yielding more efficient, lasting tubesDescribes new modulation methods affecting power tube design and application, including digital technologies
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Doherty amplifiers Circuit Diagram
Doherty for Bell Laboratories (whose sister organization, Western Electrical, was then a vital manufacturer of radio transmitters). The Doherty amplifier consists of a class B primary or carrier stage in parallel using a class C auxiliary or peak stage. The input signal is split to drive the two amplifiers along with a combining network sums the two output signals. Phase shifting networks are employed inside the inputs and the outputs. Throughout periods of low signal level, the class B amplifier effectively operates on the signal and the class C amplifier is cutoff and consumes little power. Throughout intervals of high signal level, the class B amplifier delivers its maximum energy and also the class C amplifier delivers up to its maximum energy. The efficiency of previous AM transmitter designs was proportional to modulation but, with common modulation usually around 20%, transmitters have been restricted to under 50% efficiency. In Doherty's design, even with zero modulation, a transmitter could attain at the least 60% efficiency.[13]
As a successor to Western Electric for broadcast transmitters, the Doherty concept was considerably refined by Continental Electronics Manufacturing Firm of Dallas, TX. Probably, the ultimate refinement was the screen-grid modulation scheme invented by Joseph B. Sainton. The Sainton amplifier consists of a class C primary or carrier stage in parallel using a class C auxiliary or peak stage. The stages are split and combined by way of 90-degree phase shifting networks as inside the Doherty amplifier. The unmodulated radio frequency carrier is applied to the manage grids of both tubes. Carrier modulation is applied towards the screen grids of both tubes. The bias point in the carrier and peak tubes is different, and is established such that the peak tube is cutoff when modulation is absent (and the amplifier is generating rated unmodulated carrier power) whereas both tubes contribute twice the rated carrier power during 100% modulation (as 4 instances the carrier power is needed to attain 100% modulation). As both tubes operate in class C, a considerable improvement in efficiency is thereby achieved inside the final stage. Additionally, as the tetrode carrier and peak tubes demand quite little drive power, a considerable improvement in efficiency within the driver stage is accomplished too (317C, et al.). The released edition in the Sainton amplifier employs a cathode-follower modulator, not a push-pull modulator. Previous Continental Electronics designs, by James O. Weldon and other people, retained the majority of the traits of the Doherty amplifier but extra screen-grid modulation with the driver (317B, et al.).
The Doherty amplifier remains in use in very-high-power AM transmitters, but for lower-power AM transmitters, vacuum-tube amplifiers in basic were eclipsed within the 1980s by arrays of solid-state amplifiers, which may be switched on and off with considerably finer granularity in response for the specifications with the input audio. Nevertheless, interest in the Doherty configuration has been revived by cellular-telephone and wireless-Internet applications exactly where the sum of several constant-envelope users produces an aggregate AM result. The primary challenge of the Doherty amplifier for digital transmission modes is in aligning the two stages and finding the class-C amplifier to turn on and off very rapidly.
Lately, Doherty amplifiers have found widespread use in cellular base station transmitters for GHz frequencies. Implementations for transmitters in mobile devices have also been demonstrated.
About the Author
Marlin Manning, practitioners in the area of electronics and also had a hobby in the discipline of electronics due to the fact childhood. Starting from the analog electronics and digital electronics, microcontroller and robotics Amplifier Circuit, Tube Amplifier, Amplifier Circuit
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