Tube amplifiers

No detailed documentation has yet been found about the tube equipment manufactured by André Charlin before aproximatly 1968. The models we know of are: A 2 x 9W power amplifier with ECL 82 push-pull (schematic (not ready yet)) A 2 x 20W power amplifier with EL34 push-pull A 2 x 40W power amplifier with EL34 push-pull of similar architecture (not ready yet) Here you can download a schematic of a 2x20W tube amplifier (jpg 3.4Mb) This is a poweramp with EL 34 The layout of the tube amps may have varied to a great extent, as well as the tubes used. André Charlin never stopped to search for detail improvements in the components used, sometimes instructing his employees to dismantle a whole series of amps, just ready for shipment, in order to redo the circuitry based upon an improved layout he had invented the night before in his lab. It could have been very small changes affecting the positioning of electric ground or just a connector... Hardly a very commercial aproach... The pictures below are all of the small ECL82 amplifier and its partnering tube preamp. Note the modular construction with the power supply in the middle and the amplifier modules on either side. To swap a malfunctioning unit for a new one is done in minutes, clearly a heritage from Charlins exhaustive work in the professional sector where such servicability is of the utmost importance. One only wishes more amplifiers were built in this way nowdays.

The text for this pages is not complete yet, but here are some pictures to wet your appetite.
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Click on the pictures for bigger size (100-500 k)