Trioda/Triode 
Grzegorz 'gsmok' Makarewicz
"Cool" tube amplifier and rather unusual for our modern times mechanical design - everything including the charming glowing tubes is carefully hidden inside the black housing. Because there are a lot of photos of the amplifier in closed housing, I decided perversely to use as the main photo dismantled and un-retouched amplifier (dust covering elements is authentic).
Photographs and description by Zoltan.
(Andrzej Żółtowski, This email address is being protected from spambots. You need JavaScript enabled to view it.).
Mass-produced in the sixties by the East German company VEB Kligenthaller Harmonikawerke (later VERMONA) in Kligenthall, two inputs, microphone - instrumental amplifier MV3, despite the relatively small (12W) output power was extremely successful device in its class.
With the forming of the complete audio system, broadband loudspeaker, MV3 amplifier was the object of sighs and dreams of most chamber music groups, both amateur and professional, from those years because of an exceptionally dynamic and wonderfully "full" sound.
The program allows to determine the optimal operating point of a triode. It does not require installation and can be run by most web browsers. This is the first version of the program, which will be extended with new opportunities.
Low Frequency OTL Amplifier
L. Kononowicz, Candidate of technical sciences (translation A. W.),
Radioamator 1959/11
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.
Grzegorz "gsmok" Makarewicz, This email address is being protected from spambots. You need JavaScript enabled to view it. (written in 2006)
For some time I had the intention to build an amplifier based on the famous "devil" tube 6S33S (6C33C). I heard about this tube a lot of contradictory opinions. The fundamental flaw mentioned, is the time instability of it's parameters. Unstable anode current during operation of 6S33S tube is a constant theme in almost every discussion board dedicated to electron tubes. With all its disadvantages 6S33S tube is mysteriously attracted for audio designers. Why? I do not know. Probably anyone who used this tube had their own reasons. As for me there are also several important reasons. I will mention one - it looks very cool, and these "devil's horns" - amazing!!!