Balance and Compensation?

[MikeH]

When I bought some IC's recently, I got slipped one of the wrong kind.  An NTE894M.  I looked up its Data Sheet and it's a low noise single-opamp, but it has pins labeled "Balance", "Compensation" and "Balance/Compensation".  What are these pins used for?

Here's a link to the datasheet:  http://www.datasheetarchive.com/search.php?q=NTE894M

[db]

This part is basically a re-badged NE5533.

The balance adjustment is for nulling out DC offsets (if these are a problem for you - generally ignored for most AC stuff).
The compensation facility allows addition of an external frequency compensation capacitor to improve or guarantee stability in unity gain amplifier configurations.

See the following datasheet for details about how to use these pins:
http://www.ortodoxism.ro/datasheets/philips/NE5533A.pdf