I just purchased an OP027 to replace the OP177
which I now use but saw no difference in the results.
The baseline shifted 200mV but that compensated
nicely using the zero feature at pins one and eight.

It seems to me these two chips are about the same ??
Pinout is identical.

There seems to be a military spec chip
for $20+USD but I got the $2USD one instead.

Can anyone say there's a better Op Amp than these
to use as a Preamp ?

geoff
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