22 Watt Dual-Triode Amplifier XP15936

• alternative name: Wholesale Radio

Incorporating such advanced features as "Phase Inversion" and "Push-Pull Parallel Output Stage" this Amplifier Is truly modern in design. Its output has been very conservatively rated at 22 watts and it is therefore suitable for use in Auditoriums, Dance Halls and similar locations where a fairly large output is required. 

The unusual circuit, as used in this amplifier, is as follows: a type 53 duo-triode is used as a phase inverter which is coupled to another 53 duotriode as a stage of push-pull amplification. This is, in turn, coupled to four 2B6 dual-triodes in a push-pull-parallel output stage. Plate current is furnished by an 83 mercury vapor rectifier tube.

All stages are resistance-capacity coupled, thus doing away with the inherent difficulties of transformer coupling such as limited frequency response, hum pick-up, etc. Frequency response is exceptionally fine, varying only plus or minus ½ db. between 60 and 10,000 cycles per second. The use of four output tubes in a push-pull-parallel circuit makes possible the exceptionally high output of 22 watts with a peak output of 30 watts! The output tubes are of the new dual-triode type (2B6) and are actually two direct coupled stages of amplification within each tube. The use of these tubes is one of the reasons for the excellent frequency response obtained. 

Imput impedance to the amplifier is 500,000 ohms and permits the direct connection of a high impedance phono pickup thus eliminating the need for matching transformer. Microphones and low impedance pickups must he used with suitable matching transformers. 

The amplifier is supplied less the output transformer and the output impedance is therefore that of the load required by the tubes—5,000 ohms plate-to-plate. An output transformer having this impedance and the following secondary impedances is available: 500 and 250 ohms for lines, 2, 4, 8 and 15 ohms for voice coils of dynamic speakers.

XP15936 — Lafayette  Amplifier less tubes and output transformer.  $27.50 USD.

XA406 — Output Transformer as described above.  $5.25 USD.

Kit of Matched Tubes  $7.95 USD.

Vous pourrez trouver sous ce lien 1801 modèles d'appareils, 1659 avec des images et 425 avec des schémas.
Tous les appareils de Lafayette Radio & TV Corp; New York (NY)