Patent classifications
H
ELECTRICITY
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H03
ELECTRONIC CIRCUITRY
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H03F
AMPLIFIERS
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3/00
Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
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H03F3/181
Low-frequency amplifiers, e.g. audio preamplifiers
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H03F3/183
with semiconductor devices only
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H03F3/185
with field-effect devices
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H03F3/1855
with junction-FET devices
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