The newer model using six AA cells lists these three in T.O. 33A1-12-933-11
dated 1 Sept 79.
Possibly your model is the same in that area.
<http://bama.edebris.com/download/military/psm37/33A1-12-933-11_6333.pdf>
Manual shows U1 TL066
U2 LF351
U3 LF351N
K7DFW
..._._