Ancient operational amplifier

[Boncuk]

Hi,

there is an article in ELEKTOR magazine about operational amplifiers using vacuum valves.

Here is the picture of the first reliably working OpAmp, made by Philbrick Researches 1952.

Impressive, isn't it?

Boncuk

 

[Hero999]

I believe I've seen that picture before, I can't remember where though.

 

[Nigel Goodwin]

I believe I've seen that picture before, I can't remember where though.

Same here, it's on this 741 tutorial page (and no doubt loads of other places)

 

[jlh69]

Here perhaps?

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