Are you sure you haven't been able to find any information on any of those components?
Have you tried, oh, I don't know, Google?
I did (searching for 04пп2), and I got several results that look promising. Unfortunately, they're in Russian, as one might expect. I Google-translated one of them, and sure enough, it shows this part as a "signal AGC". So I have a hard time believing Sceadwian's dire pronouncements that all this information is now in some kind of black hole. Maybe you need to do a little more research.