Re: [OT] Amplification before tubes existed


John Griessen
 

On 9/3/21 14:05, greenboxmaven via groups.io wrote:
General Electric used saturable reactors and magnetic amplifiers to regulate the generator field excitation on many models of ALCO locomotives in the 1840s and 50s.
DAng Bruce! You're getting old -- probably 190 by now...

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