| From light-bulbs
rectifier-tubes were made. Later the tube-amplifier was
invented. In 1904 Fleming patented the diode
rectifier/detector. The next development, the triode
amplifier, was patented by Lee de Forest in 1906.
This EVN 171 from
Telefunken appeared in 1914. It is an early triode tube
which is factory made. It's construction is still
primitive, it consists of:
- filament
- grit
- plate
Through the construction of
this early tube we understand the naming of these
components in later tubes.
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