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Four valve battery receiver
Oak "salon" cabinet with lockable door and hinged lid. Pink coloured front with gold lettering: "Unigro, wettig gedeponeerd (registered trade mark)", the type number and the letters "K" and "L", for medium wave and long wave.
A removable frame with a celluloid window is situated below the lid, as an extra protection. Through this window the inside of the radio can be seen, without being able to touch anything.
The uppermost knob is for reaction control, the on/of switch is visible in the middle, a wave length switch below. Tuning knobs (both with fine tuning) are on the left and right of the front. A volume control knob is placed in the left hand side of the radio, as are the three different antenna sockets. A loudspeaker can be placed on top of the lid, accumulators and batteries can be placed in the compartment behind the door.
The valve set is unknown, but was probably A409, A425, A435 and B403.
The original price of the receiver was f 180,-
A small crack in the door was repaired and a problem with the joints of the four panels was fixed by Ruben Spelbos, furniture restorer in Utrecht.
 Data Valves  
Serial number: 4180
Dimensions (hwd): 100 48,5 32,5 cm
Made in: 1928
Purchased in: 2011
Voltages: 4/80/120 V   Grid bias: -6 en -15 V
   

Click on a valve for more information

Circuit

What was broadcast in 1928?

 

Listen to "Sascatchewan" by the orchestra of George Fisher, vocals by Eddie Grosbart, recorded on October 15, 1928

Inside
A frame with a celluloid window is visible below the lid
Front
Advertisement in the Leeuwarder Courant, December 24th, 1928

This page was last edited on 28.04.2019