Push-pull Operation Research Articles

An Electronic Multicoupler and Antenna Amplifier for the VHF-Range

A single-stage distributed amplifier for the frequency range from 25 to 223 Mc/s may be used as an antenna amplifier for compensation of cable-attenuation or, in connection with a divider network, as a multicoupler for feeding six receivers from a common antenna. Singlestage amplification results in not only low noise level due to the parallel tube circuitry employed but also in a low cross-modulation figure. Second order distortions are minimized by special push-pull operation without doubling the number of tubes. Another advantage of the distributed amplifier is its reliability, which is further improved by dividing the power supply into two independent sections.

A high efficiency - high quality audio frequency power amplifier

The development of the power amplifier discussed in this paper was undertaken with the objective of providing a large amount of good quality audio power in a small package at relatively low cost. The size of an amplifier package and its cost are dependent largely on the efficiency of operation and the power sensitivity of the output stage. Ream power tubes satisfy these two requirements more readily than triodes. The quality of the audio power is improved. by the use of push-pull operation and large amounts of feedback. The use of a suitable amount and type of feedback with beam power tubes eliminates the advantage of inherent low output impedance obtained with triodes. In Class A or Class AB operation the dynamic characteristics of the two tubes may be matched to obtain a reasonably linear characteristic, and while feedback is desirable its use may sometimes be avoided. In Class B operation it is not possible to match dynamic characteristics to get linear operation, and therefore a large

The Cathamplifier

This paper discusses an amplifier circuit with high input impedance which permits push-pull operation from an unbalanced source. A voltage, proportional to the total circulating current of the push-pull system, is obtained from a transformer connected in the cathode circuits of the output valves. Over-all performance similar to usual push-pull operation may be obtained. The possibility of a single- or two-mode oscillator is also discussed. Because of the simplicity, and general application of this circuit, some of the more useful formulas are developed in detail.

A Single-Ended Push-Pull Audio Amplifier

An amplifier circuit for push-pull operation of two output tubes that provides a direct output to a grounded load is described. This circuit avoids any necessity for close magnetic coupling between halves of a split primary of an output transformer; it does not use any interstage coupling transformer; and its simplifies the application of feedback from the output stage to preceding single-ended stages. Methods for using this circuit with triode and beam-power output tubes are given, and the ultimate possibility of eliminating the output transformer for driving a loudspeaker is discussed.

An Improved 200-Mil Push-Pull Density Modulator<!--<xref ref-type="other" rid="fn1-10.5594_J12752">*</xref>-->

A completely new variable-density modulator utilizing a three ribbon push-pull valve is described. The entire valve is sealed by the force of the Alnico V permanent magnet on the Permendur pole pieces. Signal is applied to the center ribbon and noise-reduction currents are applied to the outer ribbons. True class A push-pull operation is obtained from the two component single ribbon valves by the use of an inverter prism which aligns the modulating and noise-reduction edges of each aperture. — An anamorphote condenser lens is used to eliminate lamp filament striations at the valve ribbon plane. An anamorphote objective lens gives a 4:1 reduction of the valve aperture in the vertical plane at the film and a 2:1 reduction along the length of the sound track. A meter is supplied to measure exposure as well as setting up “bias.” A photocell monitor is supplied and a “blooping” light for indicating synchronous start marks. — Mathematical analysis of the exposure produced by the modulating ribbon is appended as well as a similar analysis of the four ribbon push-pull valve which the new valve supersedes.

Erratum to : On the Problems of Regeneration, Push-Pull Operation, Modulation and Secondary Coupled Circuit of the Dynatron Oscillator

Erratum to : On the Problems of Regeneration, Push-Pull Operation, Modulation and Secondary Coupled Circuit of the Dynatron Oscillator

On the Problems of Regeneration, Push-Pull Operation, Modulation and Secondary Coupled Circuit of the Dynatron Oscillator

On the Problems of Regeneration, Push-Pull Operation, Modulation and Secondary Coupled Circuit of the Dynatron Oscillator