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A 20 Watt amplifier powered from the AC mains

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eng. Cz. Klimczewski, "A 20 Watt amplifier powered from the mains"
Radio dla Techników i Amatorów 1946/06

At the request of our readers, we provide a schematic and assembly diagram with a description of the low frequency power amplifier. This amplifier can be used to power 2 watts or more speakers with less power. For the amplifier to work properly and without distortion, the sum of power consumed by these speakers can not exceed 20 watts. This amplifier, thanks to various possibilities, is used for sounding squares, slides, stands, railway stations, gardens, etc. It has five inputs, to which we connect depending on the circumstances.

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Stereo Control Unit SC22 (Radford)

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Grzegorz "gsmok" Makarewicz,    This email address is being protected from spambots. You need JavaScript enabled to view it.

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Audio Tube Amplifiers

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A.W., "Audio Tube Amplifiers"
Radioamator 1961/02

Simple 2-Tube Amplifier

The output power of the amplifier is 3W.  Harmonic distortion coefficient is 2.5% and the sensitivity of the amplifier is equal to 150mV. In order to minimize hum, the cathode of the first tube is grounded (Fig. 1). A negative voltage is obtained due to voltage drop caused by the grid current. This current is very small, therefore the input impedance of the tube is equal to approximately half of the leakage resistance.

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Tube amplifier 100 BIS

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Grzegorz "gsmok" Makarewicz, This email address is being protected from spambots. You need JavaScript enabled to view it.  (opracowanie z 13.07.2004r.)

After the PS-1 control unit, I became the proud owner of 100Bis tube amplifier. This amplifier and PS-1 control unit constitute  an electroacoustic set. More specifically, the set includes two such amplifiers and one control unit. Amplifier, which is presented below is of excellent condition. The only apparent damage (except for scratches resulting mainly from improper storage) is a small loss of the plastic shield, which acts as an amplifier decorative front panel.

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The QUAD II Amplifier

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Grzegorz "gsmok" Makarewicz, This email address is being protected from spambots. You need JavaScript enabled to view it.

The QUAD II tube amplifier was manufactured by a company with big traditions, as founded by Peter J. Walker in 1936, SP Fidelity Sound Systems, renamed later in the same year to the Acoustical Manufacturing Co. Ltd. The company was initially located in London, but after a bombing in 1941, was moved to Huntington. The name "Ouad" is an acronym for "Quality Unit Amplifier Domestic" and I must admit that the equipment bearing this name deserve to be called a high-quality audio equipment. The name "QUAD", used for many years only to manufactured products became so known in the market that in 1983 the company changed its name to QUAD Electroacoustics Ltd.

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