Superheterodyne reflex receiver

Walnut and oak veneered cabinet with bakelite dial surround and bakelite knobs. The radio still has the original Erres loudspeaker cloth. The radio has medium and long wave. The design is by Otto van Tussenbroek.
The reflex circuit in this radio has a problem with the reception of stronger stations. A strong aerial signal causes the rf/lf tube (E444) to overload and switch to anode detection. The signal then goes directly to the control grid of the output valve. Volume control is then no longer possible. The automatic volume control (AVC) also does not function properly in this situation. The AVR only works on the AK2 mixer tube, making the situation even worse.
This problem can only be solved by using an antenna attenuator in case of strong signals or by using a small antenna. At the time the radio was produced this problem must have existed too, but to a lesser extent. Transmitters were not as powerful as today, and modulation was not as intense.
The original price was f 119,-.
Data Valves  
Serial number: 2904
Produced: ± 3100
Dimensions: 34 × 45 × 23 cm
Made in: 1935
Purchased in: 2005
Sold in: 2023
Click on a valve for more information

Circuit

What was broadcast in 1935?
 

Listen to "I wish I were twins" by Coleman Hawkins and The Ramblers Dance Orchestra, recorded on February 4, 1935 in Pulchri Studio, The Hague.
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Advertisement in De Graafschap-bode, November 23, 1935

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