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| Four valve battery radio
made in 1926 |
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In Frans Driessens' book: "Opkomst
van de Nederlandse radio-industrie", two versions of
this type are mentioned, both with a cabinet
just like the one pictured above. A model with
external valves on top and feedback coils on the front,
made in 1926, and another model, made in 1927,
with internal valves and feedback coils. The radio
pictured above was made in 1926 and looks like
it was made after the early version and before
the later version of 1927. The circuit is based on
resistance amplification. The original valve set
is unknown, but must have looked like this: HF:
A409, detector: A409/A410, LF1: A415/A425, LF2: B406.
In an advertising leaflet, the radio was said to
be "made by Delft engineers".
It
was recommended to use a Farrand Senior or Junior
loudspeaker or a Sandar double cone loudspeaker.
The radios were
sold at the
Kunstzaal Edison or at a number of agents.
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| Serial number: |
1190 |
| Dimensions
(w×h×d): |
38,5 × 38,5 × 25
cm |
| Made in: |
1926 |
| Purchaced in: |
2007 |
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Click on a valve for more
information |
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Circuit |
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Back |
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Back with a view of the valves |
| In the
compartment under the chassis
a coil set and a battery for negative grid bias
(-4,5V and a tap for -1,5V) can be housed. Jacks for other
voltages, a loudspeaker, earth and antenna and
two
rheostats are situated on the back of the
chassis. |
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The coils for
medium wave (left) and long wave (right) |
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A look below the chassis |
The Farrand Senior
loudspeaker |
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Type 4A with valves on top, made in 1926 |
Type 4A with internal
valves and coils made in 1927 |
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Advertisement in magazine Radio
Wereld, 1926 (valves on top) |
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Advertisement in magazine Radio
Wereld, 1927 (valves internal) |
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| Advertisement in NRC,
November 1st, 1926 |
Advertisement in NRC, Ocober 27th,
1927 |
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