Re: Early solid state power amps

In <56gDf.76632$vH5.1009901@xxxxxxxxxxxxxxx>, on 01/30/06
at 04:54 PM, "Geoff@work" <gwood@xxxxxxxxxxxxxxxxxxxxxxxxxx> said:

>"JohnR66" <nospam@xxxxxxx> wrote in message
>news:TPfDf.568924$zb5.1119@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

>> In this case, the IC was for small battery powered radios. It was in a
>> TO-5 can (or similar) with several radial leads. I saw it in a 1968-69
>> Popular Science (or was it Popular Electronics), that had an article of
>> how to build a small amp around one. I don't remember the part number.
>> BTW, wasn't the 74 series logic ICs introduced around then?
>> John
>>

>I recall an NE543k (???) servo amp in a TO5, but that was 70's, not
>60's....

They are not giving an exact date but Wikipedia claims "late 1960's"
for the 741

http://en.wikipedia.org/wiki/741_operational_amplifier

I can recall starting to read about IC based audio circuits in the mid
to late 60's.

---

Much better reference:

http://smithsonianchips.si.edu/augarten/p18.htm

peggs the 741 in 1968 as a successor to the 709.


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