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M.R., "Tube in the amplifier output stage"
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.