3-Stage Amplifier XP15939, XP15941

• alternative name: Wholesale Radio

Three stages, having the exceptionally high gain of 100.2 db., are used as follows: a type 57-pentode tube is resistance-capacity coupled to a type 56-triode which is, in turn, transformer coupled to a pair of 2A5 pentodes in push-pull. An average output of 10 watts with a peak output of 14 watts is obtained! Overall amplification is so great that input connections are provided for the second stage. Input devices having high outputs, such as magnetic phono-pick-ups, are to be connected to the second stage. If connected to the first stage the output tubes will actually overload.

 A gain, or volume, control is provided for the first stage and a tone control, effective on either input, is also incorporated. A tone control is unusual in an amplifier of this type, and at this price, but, since a little tone correction is desirable in many installations to overcome peculiar acoustical conditions, it has been included. In short nothing has been overlooked that would contribute to a finer and better product. 

Both workmanship and the quality of the components used are of the finest. All components being considerably oversize so as to withstand far greater loads than they will ever be called upon to carry. Two models are available —with —and without output transformer. When furnished with output transformer the output impedances are as follows -2, 4, 8, and 16 ohms for speaker voice coils and 250-500 ohms for line. Without the output transformer, impedance is 10,000 ohms from plate to plate.

XP15939 —Lafayette Three-Stage Amplifier, completely assembled and wired. Less tubes, loud speaker and output transformer.  $19.50 USD.

XP15941 —Same as above, but with output transformer, less tubes $23.25 USD.

Kit of matched tubes, consisting of 1-57, 1-56, 2-2A5's, 1-5Z3.   $2.82 USD.

Donde encontrará 2018 modelos, 1876 con imágenes y 425 con esquemas.
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