Unit combination
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Unit combination
Three units mounted on a mahogany base, consisting of the Gambrell Variable Condenser 5006, surmounted by a unit for fine tuning (right), a Reaction Unit 4118 (middle) and a Sonus Valve Panel (left).

Advertisement in Wireless World, September 1923

The antenna can be connected at the fine tuning unit; the tuning capacitor is 240 pF.
The Reaction Unit in the middle can be used to control feedback by means of a fixed and a movable coil.
The two coils, labeled "A" and "B" "(see advertisement), can be used for 60-260 and 100-420 meters respectively (in combination with the 240 pF capacitor).
The Sonus Valve Panel comprises a valve holder, filament resistance, grid condenser and leak, and a telephone condenser. On the left of the unit are connections for the filament current and the headphones and on the right there are connections for the HT voltage of the Cossor P1 detector valve. The price of this unit was 0.37.6.
Gambrell coils were made in a different way than most of the coils at that time, because they were wound in separate spaced layers, and not on top of each other, such as in a honeycomb coil. The ribbed pattern that can be seen on the outside of the coils is formed by the ebonite strips that hold the layers in place. These patented coils were reviewed for the first time in the magazine Wireless World of October 7, 1922. The price of one coil was 5s/9d.
Data Valves
Serial number: none
Dimensions (hwd): 19 39.6 x 17  cm
Made in: 1923
Purchased in: 2014
Click on a valve for more information

What was broadcast in 1923?


Listen to "My Buddy" by the orchestra of Bert Ambrose, recorded on April 3rd, 1923.

Top view

The underside of the Sonus Valve Panel
On the left of the rheostat for the filament voltage of the detector valve, the 5 Megohm grid leak resistor can be seen. The 50 pF grid capacitor can be seen above the rheostat, and the telephone capacitor (4nF) is at the right.

Advertisement for the Sonus Unit Valve Panel in Popular Wireless, July 1st, 1922

This page was last edited on 27.04.2019