Found this the other day, a nice history of op-amps from Analog Devices, including some of the very early predecessors using tubes. Also covers a bit about Differential amplifiers and Phase Inverters as the subject comes up naturally in this sort of discussion.
http://www.analog.com/library/analogDia ... _final.pdf
A history of op-amps including early tube circuits
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Re: A history of op-amps including early tube circuits
My beanie prop is spinning. Thanks for the wind!
I build and repair tube amps. http://amps.monkeymatic.com
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David Root
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Re: A history of op-amps including early tube circuits
Mine too. I only read the chapter on all-tube op amps so far but the number of *GEBs working on this stuff as part of the war effort is remarkable.
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When I was a boy I was told that anyone could become President. I`m beginning to believe it--Clarence Darrow
Re: A history of op-amps including early tube circuits
Definitely. Glad you enjoyed it. I saw GEB and my first thought was Douglas Hofstadter haha. Someday I'd love to build myself an analog computer for solving ODE's but that's some serious time investment. Would be a fun toy to play with though haha.