SHOWCASE 14. CELL 14-14
1920s:
The Times of Crystal Sets and… Integrated Circuits
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Loewe 2H 3N - Battery broadcast 2-V-2 receiver of 1927
using just two "multipurpose" tubes. Manufactured
by Loewe-Radio of Berlin, Germany. To
be continued after the picture set...
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The
2H 3N employs two of Loewe "Multipurpose Tubes"
(Mehrfachröhren),
namely
2 HF
and
3 NF. 2 HF has two tetrodes inside while 3 NF has three triodes.
Also some resistors and capacitors are encapsulated inside
the common glass with tetrodes and triodes making the
Multipurpose Tubes real integrated circuits - the world's
first IC's designed as early as 1926. To
the contrast with another famous receiver of Loewe, the OE 333
which was built around 3 NF tube and was designed
for local stations reception (OE = Ortsempfänger,
i.e. receiver for local stations), the 2H 3N
was true DX receiver (Fernempfänger)
having 2-stage RF amplifier.
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