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Radiomuse |
Model 454A |
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Schematic: |
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This is a French AM receiver produced around the year of 1946. It operates in four wave bands: Short waves 1 (O.C.1): 14 to 24m; Short waves 2 (O.C.2): 25 to 50m; Medium waves (P.O.): 200 to 500m; and Long waves (G.O.): 1000 to 2000m. The band switch is located on the right side wall of the radio with the tuning button above it. It is a four-position switch (on the right). The tone switch has the following positions: "Grave" (bass), "Parole" (voice), "Musique" (music) and "Pick-up" - the forth position is used to select the pick-up input. On the left on the front panel it is located the volume-control/power-switch. On the back, besides the unavoidable aerial and ground connectors, there is the pick-up input and an output for an extra loudspeaker. Vacuum tubes: 1883 full-wave rectifier - power supply; EL3 pentode - output stage (data sheet HTML); EF6 pentode - audio pre-amplifier (data sheet PDF, 106KB); EM4 tuning indicator (data sheet PDF, 21KB); EBF2 pentode - IF amplifier, diode 1 - automatic gain control and diode 2 - detection (data sheet PDF, 43KB); ECH3 hexode - mixer, triode - local oscillator (data sheet PDF, 75KB); The schematic diagram has been "reversed engineered" by myself to repair the set - there is no guaranty of being 100% accurate. Aerial Circuit and Local Oscillator (schematic JPG, 43KB); IF stage, Detection, AGC and Magic Eye circuit (schematic JPG, 25KB); Audio amplifier (schematic JPG, 35KB); Power supply (schematic JPG, 84KB).
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