R.R. Radio
    Superécran 456
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Five valve superheterodyne AC receiver

In dark brown polished wooden case with silver plated solid brass knobs, and scale frame, illuminated scale, with station names printed in two colours (black - medium wave and red - long wave).  Three decorative black bars are arranged in front of the loudspeaker. The receiver has five American tubes.
The knobs from left to right: wave length switch, tuning, on/off/volume.
Receives on medium wave (192-570 meters) and long wave (770-1920 meters). The intermediate frequency is 152 kHz.
With band-pass filter and anti-fading. The loudspeaker, with field excitation coil, has a diameter of 20 cm.
At the rear are two antenna connections, earth, a tone switch with two positions, a connection for an additional loudspeaker and a pick-up connection. The correct mains voltage can be set by means of a white porcelain plug with a built-in fuse.
The radio plays well on the "short" side of the scale, but the sensitivity decreases quickly on the long side. This is due to the band filter type. It is a filter that is actually designed to filter on a fixed frequency, but in this receiver it is applied for an adjustable frequency.
There is a top capacitor of 10 pF in one of the coil buses, while there is no inductive coupling between the coils, and also no base capacitor. So it seems to be a somewhat flawed design. With the same coils and an extra resistance it could work much better. In 1935, a band filter was still new;
the most sophistcated design at the time was Varley's (with inductive coupling and a 100 ohm resistor).
Above a picture from a product leaflet for the year 1936.
The original price was BFr 1295,-. The luxury version (650L) has a somewhat finer cabinet, a different tone control and a wavelength indicator. The price was BFr 1550, -.
Data Valves  
Serial number: 16987
Dimensions (h×w×d): 42 x 38 x 27.5 cm
Made in: 1935
Purchased in: 2018
Sold in: 2023
Voltages: 110/130/220V~
Weight: 12 kg

Click on a valve for more information


What was broadcast in 1935?


Listen to "Yes Sir, That's my Baby", by the Brian Lawrance Quartet, recorded in 1935


Top view of the chassis

Under-chassis view
Page from a leafet from 1936 with the models 640, 650 and 650L

This page was last edited on 27.11.2023