One-valve AC reflex receiver. The first model made in 1945 (left) and the later model, the 37A-46, made in 1946
After the liberation of the south of The Netherlands in September 1944, Philips started the production of a simple radio for the reception of the Eindhoven based radio station "Herrijzend Nederland", (Emerging Netherlands), on 415 meters.
The radio has no tuning knob, but is "fixed tuned" between 400 and 450 meters. A small trimmer was used to adjust the right frequency.
The first version (with one fixed station) was presumably introduced in the beginning of April 1945; a version with two fixed stations in the second half of November 1945. In the mean time adjustment sets were sold when a second transmitter came on the air.
The radio was made with a number of internal and eternal designs: a selenium rectifier, situated above the loudspeaker, a selenium rectifier below the loudspeaker. The last version of the "Luistervink" was made with aircraft material (triplex, coated with aluminium), presumably German material that was left behind. The second radio pictured above is the last version, made by NSF in Hilversum around 1946.
This model has two fixed wavelengths: 415 and 301,5 meters, the last frequency was used when regular broadcasting was resumed on January 20, 1946 by station Hilversum I, using the transmitter in Lopik. Hilversum II took over the broadcast of "Herrijzend Nederland" in the same period.
This version also has a real scale lamp, 8045D, above the loudspeaker, whereas the older models use 6 volt bicycle lamps.
The receiver uses only one valve. In older models the ECF1 is used, in newer models, like the 37A-46 on the right, a ECH21. A reflex circuit uses the pentode section (in case of a ECH21, the heptode section) of the valve for hf and lf amplification. The triode section of the valve is used for detection. A selenium rectifier provides the anode current.
The original price was f 60,- for the model with 1 station and f 65,- for the model with 2 stations.



Tube 37A

Tube 37A-46 Circuit
Serial number:

3636 (chassis)


Click on a valve for more information
Click on the circuit to enlarge
Dimensions (hbd):

20.7 x 20.7 x 8 cm

20 20 8 cm

Made in:



Purchased in:



Sold in:   2023

What was broadcast in 1945?


Listen to a Dutch newsreader announcing the German capitulation, recorded on May 4, 1945

The 37A with (replica) back panel The 37A-46 with back panel

The interior of the 37A The interior of the 37A-46
The chassis still looked original, only the situation around the trimmer capacitor had been altered, probably to change the "fixed" frequency. The content of the double smoothing capacitor was replaced. The output transformer had to be replaced, as well as the contents of the smoothing capacitor (made in 1943) on the right. Capacitor C7 (see circuit) was invisibly replaced by a newer one. The ECH21 was not functioning and had to be replaced too.
The back panel of the 37A-46 was made from the back panel of a Blaupunkt radio, still available in the Philips factory, as material was scarce after the war.
Advertisement for the first Luistervink in newspaper "Oost-Brabant" of April 9,1945. Advertisement for the second version of the Luistervink in newspaper Bredasche Courant of November 17, 1945

This page was last edited on 07.02.2023