Bob I don't know but here is some more info:

I need a generic part # for 20 pin dip op-amp IC as NTE and extensive
Google search did not help.Here are the specs for the required part as
I could not find any more info on U1 for the Bose in question below:

Pins:
1=op-amp1,audio in
2=
3=
4=
5=op-amp2 in
6=
7=
8=op-amp2 in
9=
10=op-amp2 out
11=
12=
13=
14=
15=
16=compresson rectifier in
17=compressor time network
18=gnd
19=half voltage supply
20=vcc (12v) (12 ma draw)

Sidney
E-mail:sidneybek(at)yahoo.com
Dartmouth,Nova Scotia
Canada