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Philips 4603 (GRD
III) |
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Used in
municipal wire broadcasting networks (G.R.D., Gemeentelijke
Radio Distributie) in the 1920s and 1930s |
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Triode |
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Part of a G.R.D.
in Utrecht, Menno
van Coehoornstraat in 1935. A transmitter tube
(Philips MC2/200) is
used as amplifier |
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