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| Four valve, two
circuit radio for AC |
| Solid beech cabinet, coloured with red aniline. Arbolite front,
top and side panels. Both tuning scales are
illuminated. The cabinet was a bit rickety and had open
joints. Furniture restorer Ruben Spelbos, Utrecht, restored
this cabinet. |
| Weco also made
loudspeaker cabinets, that could be used together with
the radio (see picture below). |
| Knobs under the scales: primary and
secondary tuning. Small knob in the middle: push/pull wave length
switch (medium wave/long wave), above that, a knob for reaction
control. A volume
control knob is situated at the right hand side of the
cabinet. Antenna and earth can be connected at the
left hand side. A loudspeaker and a gramophone player
can be connected at the back of the receiver. |
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| The receiver was made using three
components that became known as the Weco block system
(power block, coil block, and amplifier block).
Magazine Radio Wereld
of June 7th, 1928, published an article and a blueprint
of a
predecessor of the Weco Afgeschermde Drie
(Shielded Three). This
receiver was called RW Afgeschermde Drie. A Weco advertisement (see
below) supported the article. Designer of this receiver
was I.J. Citroen.
This first model was a
three-valve receiver, with two shielded Baltic coils
(Biedermann & Co, Wecos sales organisation, imported
these coils) and a number of Weco parts (an LF
transformer and two HF choke coils). As an
alternative for the rather expensive Baltic coils,
two shielded Weco coils could be used. These coils
were already made to measure for the Radio Wereld
circuit.
The article also shows
that it is possible to make an AC version, using a Weco transformer
for
filament current and the Philips AC
tubes C142, F215 and D143.
In Radio Wereld of
July 5th, 1928 the four tube RW Afgeschermde Vier was
introduced.
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| Data |
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| Serial number: |
330 |
| Dimensions
(w×h×d): |
24 × 44 × 29 cm |
| Made in: |
1929 |
| Purchased in: |
2010 |
| Voltage: |
220 V |
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Valves |
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Click on a valve for more
information |
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Circuit |
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|
Back of the chassis |
|
On the right the Weco transformer is visible. In
the original schematic this transformer is called "Triplo Combinatie"
(filament and plate voltage, and choke) |
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Back with metal backpanel |
|
The backpanel is a replica, made after an
original backpanel from the Radio Museum in Reusel. |
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|
Top view of the chassis |
|
The three main components are clearly visible
here. The purple coil block is made of a zinc like alloy. |
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|
The interior parts of the coil block,
photographed from two angles. On the left, the primary torodial
coils for medium and long wave
can be seen, on the right the secondary |
coil and the
reaction coil are visible. The wave length switch is mounted on
the partition between the two coils. |
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|
Below the chassis |
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|
Bottom of the coil block with serial number
(330), production date (December 27th, 1929) and autographs of
the maker and the inspector. |
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Advertisement for the WECO Afgeschermde
Drie receiver in AVRO-bode, July 5th, 1929... |
...and in Radio Wereld,
September 19th, 1929. Inflation is clearly visible in the prices
in this ad. |
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