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www.technology1.co.uk
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The circuit diagram of an early audio amplifier using the audion triode. This is probably a circuit used sometime around 1911 to 1915. It is really just the valve connected up with batteries and transformers to apply the necessary voltages and handle signals.
It is drawn using modern circuit symbols. The low voltage batteries are shown as single cells for clarity only.
Multiple stage amplifiers were also developed. These were probably just a number of identical stages similar to the above, but with a single transformer serving to couple the output of one stage to the input of the next.
For comparison here is a diagram by Lee de Forest himself showing an early experiment with a diode. Not the similarities of the circuit connections.
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This site is written by S. J. Farthing, Portsmouth, England.
My personal site and e-mail address are at: www.farthing.me.uk
