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- Written by: Grzegorz Makarewicz
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A website dedicated to various topics that interest me. Retro electronics – primarily devices using vacuum tubes, forgotten old corners of Warsaw, playing with artificial intelligence, and other topics that strike my fancy at the moment.
I also try to recreate descriptions of devices I once posted on the now-defunct FonAr and Trioda websites. These descriptions are not only mine, but also those of my friends, primarily from the Trioda Forum. And to lighten the mood, here's a drawing from a book from over half a century ago.
Mr. Wojciech Ładno illustrated several radio engineering books. I enjoyed reading them not only for their substantive content, but also for his always witty illustrations.
Philips EL 6411 Tube Amplifier
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- Written by: Grzegorz Makarewicz
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Text and photos: gsmok, Warsaw, Last update: 05/09/2004
On July 29, 2004, thanks to the Allegro auction service, I became the owner of a Philips tube amplifier, model EL 6411. In accordance with the accepted custom, my cats were the first to evaluate the amplifier. As you can see, the evaluations were weighted by their individual character traits.
In the photo presented at the auction on Allegro, the amplifier looked great. In reality, it was not so beautiful. This was due to a few flaws that the seller probably "forgot". But of course I could have asked him a number of questions before bidding, which I did not do and I can only blame myself. In the two photos presented below, you can see the view of the amplifier a few moments after unpacking it from the box. Of course, you can enlarge the photos by clicking on them with the mouse.
Amateur electroacoustic amplifiers - 15W Hi-Fi amplifier
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- Written by: Aleksander Witort
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Aleksander Witort, Amateur Electroacoustic Amplifiers
Third Edition, Warsaw 1972
Appendix 3 of the book on amateur electroacoustic amplifiers includes a brief description of an interesting tube amplifier design. This is a rare topology that uses an autotransformer as the output transformer. Yes, that's not a slip of the tongue. Such "tricks" are rarely used today, but several decades ago, it was not unusual. You can familiarize yourself with the full table of contents of the aforementioned book here.
Appendix 3
15W Hi-Fi Amplifier
A characteristic feature of the amplifier described below is a simple, easy-to-make output autotransformer. The entire amplifier circuit was designed with this assumption in mind (Fig. D3-1).
Read more: Amateur electroacoustic amplifiers - 15W Hi-Fi amplifier
Audio Innovations Series 500 Amplifier
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- Written by: Grzegorz Makarewicz
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Grzegorz Makarewicz,
(Description published on the TRIODA-Grzegorz Makarewicz website on January 8, 2018)
The Audio Innovation Series 500 is a 25W Class A integrated tube amplifier. As the name suggests, it was manufactured by Audio Innovations, based in Brighton, UK. Audio Innovations was founded by Peter Qvortrup and Erik Andersson in 1984 and manufactured tube amplifiers from 1984 to 1996. In 1991, the company was acquired by Audio Components, and in 1996, the brand was acquired by Audio Partnership. The 500 Series amplifiers were developed during Audio Innovations' early days in the market, back in the 1980s.
ARG 6S33S Triode Bridge Amplifier
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- Written by: Grzegorz Makarewicz
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Grzegorz "gsmok" Makarewicz (2011),
The amplifier belongs to a group of devices made in such a small number of copies that it is difficult to call its manufacturer a manufacturer. In this case, it is difficult to even talk about a manufacture. The amplifier has no markings and finding information about the person who built it caused me a lot of difficulty. It turns out that it is a product of a company (this is a bit of an exaggeration) called ARG. It is probably the work of one person, Mr. Yevgeny Kreminsky from Lviv.
