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Tube in the amplifier output stage

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M.R., "Tube in the amplifier output stage"
Radioamator 1953/08

The biggest problem for the designer who builds himself a tube amplifier is to properly match the resistance of his speaker to the output tube that works as a loudspeaker tube. This conclusion results from the content of letters coming to the Radioamator's office, in which the most common questions are of this type: I have a tube eg P.X.25 (usually it is a type of obsolete tube). I am going to use it as a speaker tube. How do I get the acoustic power from it and how to select the output transformer to match the dynamic loudspeaker with a 5ohm resistance coil? Or another question. Is a 40: 1 transformer ratio suitable for a CL4 tube? etc. These and similar questions can be generally answered by introducing the readers to the elementary theory of the tube, working at the power stage.

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Tube amplifier WR75-62 "Ampli75"

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Photographs of WR75-62 "Ampli75" amplifier ( PZT Warsaw 1964) made and gave to us Mr Piotr Kowalski This email address is being protected from spambots. You need JavaScript enabled to view it..
The happy owner of an amplifier is Maciej Myga.

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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 100 BIS

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Grzegorz "gsmok" Makarewicz, This email address is being protected from spambots. You need JavaScript enabled to view it.  (opracowanie z 13.07.2004r.)

After the PS-1 control unit, I became the proud owner of 100Bis tube amplifier. This amplifier and PS-1 control unit constitute  an electroacoustic set. More specifically, the set includes two such amplifiers and one control unit. Amplifier, which is presented below is of excellent condition. The only apparent damage (except for scratches resulting mainly from improper storage) is a small loss of the plastic shield, which acts as an amplifier decorative front panel.

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Amplifier for the speaker "3L"

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Czesław Klimczewski "Amplifier for the speaker '3L'"
Radioamator 1953/01

In the 11th issue of our magazine, an amplifier with two tubes operating in a push-pull system using a transformer that controls these tubes was described. Since this transformer can not always be purchased on the market, its winding presents a certain difficulty - currently the description of the amplifier is given, in which the function of the phase inverter is performed not by the transformer but by means of a radio tube. The amplifier does not have a low frequency choke for current rectification but a resistor with a resistance of 300 Ω and a power of about 5 watts. The resistor is easy to buy or wind up on a porcelain or glass rod.

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