Three valve battery receiver
Battery version of the first Philips receiver, made by N.S.F. in Hilversum. The technical design is by ir. J.J. Numans; it is the first radio equipped with a pentode.
The design of the radio is, like that of the AC receiver 2514, by Ir Louis Kalff, who had also designed the scale loudspeaker. The style is that of the "Nieuwe Zakelijkheid" or "New Realism". This modern style was not everyone's taste. Especially for this radio (and for model 2501) radio cabinets were made. These cabinets housed both radio, power supply unit and battery, completely hidden from view. A cabinet like that made by A. Brandsteder in Amsterdam can be seen here.
In the left side are the knobs for volume control and primary tuning, as well as the earth and aerial sockets. On the right are the secondary tuning knob, feedback and the speaker jack. Between the two scales is the wavelength switch, numbered 1: 1000 to 2000 meters, 2: 300-600 meters and 3: 200-400 meters. In position "0 " the radio is turned off. There is an internal connection for a gramophone.
The power supply is provided by a 4 volt accumulator, an anode battery or the Philips battery eliminator 372 and an internal 18 volt battery for the grid bias. In the first devices, this was a separate metal box (auxiliary device 2505), housing four 4.5 volt flashlight batteries. Later special batteries were used.
Data Valves  

Circuit

  
Serial number: 43975
Dimensions (w×h×d): 31 × 19 × 13 cm
Made in: ± 1927
Purchased in: 2013
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What was broadcast in 1927 uitgezonden?
 

Listen to "Then I'll be Happy" sung by Josephine Baker with the Leon Jacobs Band, Leon Jacobs (t), Henri Durand (b), Sacha Grauman (d), Marcel Raskin (p), René Lovinfosse (tb), Oscar Thisse (as), N. Napolitano (cl), recorded in Liege in January 1927
The chassis, seen from a number of angles
Poster by Cornelis van Leeuwen made in 1927. The poster suggests that the radio is intended for rural areas, which have not yet been connected to the mains. Advertisement in NRC, November 1st, 1927

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