Written by Grzegorz "gsmok" Makarewicz,
This description relates to a headphone amplifier based on a very popular White Follower scheme. There are plenty of amplifiers of this type you can find in electronic books and Internet. Among the most popular there may be mentioned circuits described on HeadWize site dedicated to headphone amplifiers. The description is not completed yet. I left it unfinished deliberately, as a place to conclusions accompanying this here THREAD on TRIODA Forum. Because of this, description is a bit chaotic, and I apologize for that all visitors. Ultimately these shortcomings will be removed.
Grzegorz "gsmok" Makarewicz,
With a little help of Allegro (online auction site) I became the owner of the 100BIS PS1 tube device. Although I bought it outside the auction but Allegro was unwittingly involved in the transaction. The manufacturer of the device apparently did not attach importance to such a "trifle" as the device name. According to the inscription on the front panel and content of the Instruction Manual I bought a "control panel", and according to the rating plate information and leaflet I bought a "control console". So let me use the following description of the term -"tube mixer".
Low Frequency OTL Amplifier
L. Kononowicz, Candidate of technical sciences (translation A. W.),
In recent years, both works in the Soviet Union and abroad have been carried out on the construction of devices (including audio amplifiers) providing amplification and reproduction of sound with little distortion. In the initial stages of low frequency amplifiers, due to the low signal voltages occurring there - non-linear distortions are small, and frequency distortions can be lowered by choosing the appropriate values of the amplifier elements. The largest distortions arise in the output stage of the amplifier, the main cause being usually the output transformer. The output transformer limits the range of the frequencies to be reproduced.
Renat Terlecki, "DC Powered Power Amplifier RA360ST"
In recent times, radio engineering has gained a completely new field of activity in the form of high-power loudspeaker installations. Apart from the sound films of high-power loudspeakers, we also often meet in a whole range of public institutions such as railway stations, guest houses, hotels, sports grounds, concert halls, and even churches and parliaments.
A few years of practice has crystallized the concept of a modern power amplifier and today we require such a device:
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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