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One valve reflex receiver |
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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. |
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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. |
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A number a versions (and
intermediate versions) were made.
Version 1 has a selenium rectifier, situated above the
loudspeaker, version 2 with the selenium rectifier below
the loudspeaker, and version 3, made with aircraft
material (triplex, coated with aluminium), presumably
German material that was left behind. The radio pictured above
is the last model, made by NSF in Hilversum after the
end of the war. |
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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. |
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This version has a real scale
lamp,
8045D,
above the loudspeaker, whereas the older
models use 6 volt bicycle lamps. |
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The receiver uses only one
valve. In older models the
ECF1 is used, in newer models, like the 37A-46 pictured above, 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. |
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The back panel was made from the back panel of a Blaupunkt radio, still available in the Philips factory,
as material was scarce after the war. |
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The suffix -46 shows that the
radio was issued in 1946. |
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Serial number: |
13981 |
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Click on the valve for more information |
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Click on the
circuit to enlarge |
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Dimensions (w×h×d): |
21 × 21 × 8 cm |
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Made in: |
1946 |
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Purchased in: |
2009 |
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The inside of the radio |
| The output
transformer had to be replaced, as well as the inside 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 also. |
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| With
back panel |
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The back panel was cut out of a back
panel of a Blaupunkt radio |
