>TL064 ??? I looked in some hyper-old (1978) numbers of the Dutch
journal
>"Elektuur" and not even there it's mentioned, they use "modern" TL084
>opamps..... Maybe a prehistoric IC ????? But I will keep on searching
among
>my stuff.....


Those versions aren't by time, it's by function.  The '64 is low
power, '74 is low noise, the '84 is low cost.
It's a decent FET opamp.