[SOLVED] Any idea what this might be?

[RememberThe5th]

Just dismantled some old components soo im wondering what it could be?

Spoiler: Picture

Spoiler: Picture

 

[Ralston18]

I found the following link:

https://www.radiomuseum.org/tubes/tube_p52cdhu.html

 

[RememberThe5th]

Seems like op amp or some stuff.
I have also one more question(since i dont wanna spam with more posts)
What is this component called? It would be usefull in my project since that component isolates audio (like transformer, but 1:1 ratio 16 ohm) and removes buzzing/hissing noises, rather than ordering outside of my country. (The circled one) I havent been able to pinpoint exact name of that components.