Radio engineering time travel

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Radio engineering time travel (to 1921)

I invite you to look at the "pictures" related to radio technology. They come from various sources. The gallery has its sister version in Polish and Russian. Versions in other languages will be added successively. More detailed descriptions can be found in other language versions (articles are related and can be displayed by clicking on the icons with flags on the left, top of the TRIODA website). Of course, I will complement translations of signatures quite slowly. All descriptions are displayed using the present tense and not the past - this is not a mistake only deliberate action - a reference to the original descriptions from those years. In order not to delay the possibility of viewing the gallery, this site is made available as a "site under construction" - for which I apologize to all guests. At the beginning and end of each set of photographs there are links allowing to change the period - calendar year.

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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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Tube Amplifier Petrus

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

Tube amplifier "Petrus" is produced by a small manufacture in Ukraine. It is not known to me the number of copies produced - certainly is small - it does not prevent the fact, that at least a few copies of this amplifier operates in the environment of our domestic audiophiles.  The amplifier is based on 6S33S tubes (called "devils") operating in class A, and delivering an output power of about 15W per channel.

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Tube amplifier WR75

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Written by "Dziadek" This email address is being protected from spambots. You need JavaScript enabled to view it.

It is now fully functional copy, unfortunately without the original parts. As you can see, power amplifier uses:

• the beautiful 6P3S tubes at output stage,
• the 6N8 as a phase inverter,
• the EF183 as microphone preamplifier and
• EF80 as gramophone preamplifier.

As the result of long-term "residence" in the wet room, all the paper capacitors were "dead", and so the most of the resistors.

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