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Stereo Tube Preamplifier JJ243

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

This stereo tube preamplifier was produced by JJ Electronic. It is characterized by interesting colors reminiscent me Lotus cars competing in Formula 1 - a mixture of black and gold . I am a fan of Lotus team, so it's no surprise that I like this color combination. The only problem is the inability to take a picture in a way that surrounding objects are not reflected in the golden housing. It is presumed that one of the purposes underlying the company was to promote electron tubes produced by them (the preamplifier has as many as 8 tubes). This has been only partially successfull. Preamplifier certainly served the brand, but rather as an independent audio device, than the device equipped with tubes with JJ logo. In some copies, which I inspected I found tubes from other manufacturers.

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Speaker power amplifier

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Category: Articles
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Czesław Klimczewski, "Speaker power amplifier"
Radioamator 1952/11

Many schools, club rooms and radioamateur wheels have radio receivers but they lack amplifiers, which would enable the playback of programs by a larger number of loudspeakers installed in the rooms. For those amateurs a description of the power amplifier with the method of its assembly is given. The amplifier connected in a suitable way to the radio receiver will allow to obtain the necessary electric power for powering several loudspeakers with a total power of about 15 or 20 watts, depending on the type of radio tubes used.

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The QUAD 22 Control Unit

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

QUAD 22 preamp was designed to work with one (mono system) or two (stereo system) QUAD II amps. Its features, in particular, interchangeable external modules predestined it to act as an audio system control device. This has been reflected in the name of the device, which identifies them not as a typical preamp but the control unit (full, original name is "The Quad 22 Control Unit." Due to the fact that even the manual is common for QUAD 22 Control Unit and QUAD II amplifier, photographic presentation begins with a few shots of full audio system designed for stereo reproduction.

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Burdjak Area-41

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Grzegorz 'gsmok' Makarewicz

I present photographic documentation of tube amplifier Burdjak Area-41. This is a stereo amplifier based on 6S41S (6C41C) triodes working in non-symmetric configuration (SE). The 6S41S power tubes are relatively rare in commercial applications. The situation is different in DIY amplifiers where 6S41S triodes, being anemic cousins of more powerfull 6S33S tubes are often used. The Burdjak Area-41 amplifier provides a really enjoyable listening experience - it is of course only my subjective opinion.

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Audio Tube Amplifiers

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Category: Articles
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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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