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- Written by: Grzegorz Makarewicz
- Category: Uncategorised
- Hits: 1877
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'm also trying to recreate the device descriptions I once posted on the now-defunct FonAr and Trioda website. These descriptions are not only mine but also those of my friends, primarily from the Trioda Forum. To enhance the site's content, I've included illustrations in various sections that I found in old books, usually from the 1950s, on topics broadly related to radio engineering (these are books or excerpts from books from defunct publishers, often without identifying the authors).
Where possible, I add information about the author to the drawing.
Low-frequency amplifier with push-pull class B output stage
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- Written by: Zbigniew Faust
- Category: Articles
- Hits: 71
The description comes from the book "Construction and assembly of amateur radio systems"
Technical parameters
- Output power approx. 6 W
- Sensitivity approx. 300 mV
- Noise level 55 dB
- Frequency response 50 Hz ÷ 15 kHz (±1 dB)
- Nonlinear distortion factor approx. 1%
- Mains power supply 220 V/50 Hz
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Unbalanced tube amplifier on a 300B tube
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- Written by: Grzegorz Makarewicz
- Category: Tube equipment
- Hits: 1078
Photographs: Grzegorz Makarewicz,
At one time, fascinated by the 300B triode, a cult device in the audiophile community, I decided to build an amplifier based on this tube. As I decided, so I did. The amplifier has the form of two monoblocks. Below is a photo of one of them. I have to disappoint the purists - the monoblocks are not "visually" symmetrical, they are really identical. When you put them next to each other, they can arouse a certain distaste among aesthetes. I found out about it personally. My answer in such situations was always the same: we should listen to these monoblocks as they work together, not as they "look together". And it turns out that sometimes it helped.
Tube amplifier or the hard life of a domestic designer
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- Written by: Piotr, Grzesiek
- Category: Tube equipment
- Hits: 1006
Started by Piotr, finished and edited by Grzegorz "gsmok" Makarewicz,
Instead of an introduction
Like many enthusiasts before me and many after me, I decided to build a tube amplifier myself. I admit that I do not have much experience when it comes to tube designs. However, I am a practitioner who has "made" several systems and a soldering iron is no stranger to me. I decided to describe the process of building the amplifier in quite detail. I decided to risk making mistakes that will be visible to all visitors to this page.
Read more: Tube amplifier or the hard life of a domestic designer
OTL headphone amplifier on 6N1P tubes
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- Written by: Grzegorz Makarewicz
- Category: Tube equipment
- Hits: 1182
Grzegorz Makarewicz 'gsmok'
(the description comes from archive materials published some time ago on the TRIODA - Grzegorz Makarewicz website)
This description concerns a headphone amplifier based on a very popular scheme using a White follower. The description is not a closed study, but only a place to place important information accompanying the thread on the TRIODA Forum. Therefore, at least at first, it may seem a bit chaotic - for which I apologize in advance. Ultimately, I intend to place here detailed results of simulation calculations, results of measurements using different types of headphones and a description of the practical implementation of the amplifier based on the printed circuit boards designed for it.
A characteristic feature of the described amplifier is the high dependence of technical and listening parameters on the headphones used. For the set values of the components, the amplifier can play delightfully driving some headphones and embarrassingly driving others.