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Radio
receiver model OE-333 made in Germany by LOEWE Radio
in 1926, operating with only one valve type 3NF. This
valve is considered the first type of integrated circuit
contained three triodes, two electrical anode resistors,
two screen resistors and two coupling capacitors. This
type of receiver used only one valve to diminish the taxes
charged by the German government soon apos the First World
War. |
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Radio
receiver model 9W made in Germany by Telefunken. It used
6 valved arranged in a Neutrodyne circuit. |
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