The schematic is pretty hard to read. A better scan at higher resolution would help. It would also help to explain what this device is supposed to do, and what external connections have what properties. It looks like it has pluggable modules at right, some sort of oscillator, and a control to adjust a meter reading (maybe to null out a signal?). Without knowing the overall purpose, everything else would just be guessing.

@Olin Lathrop. I've added a link to the full documentation where everything could be seen. I have to go work, but later, I will add pictures if necessary.

Half that page has some foreign script, like Arabic or Hebrew. Besides, I don't want to read a whole manual. You should explain in a paragraph or so what this thing is supposed to do, what the user interface is, etc. I've never heard of a "grid dip" before, and certainly have no idea what you think that means. I noticed that the page you linked to calls it a "test oscillator" and doesn't mention "grid dip".

@Olin Lathrop. A grid dip is a very well known device from the past, that is still used by radio ham. Google@grid dip to see tremendously many entries. I am not supposed to write an article here, sorry. Yet, since you say the question is unclear, I have added what I think that should be added to make it clearer. I don't understand why the page I've linked appears to you in foreign script: that's not the case for me.

There is a saying: When everyone around you stinks, maybe it is you who has .... your pants. But seriously, back off a bit Olin. Why are you berating everyone, the man gave a good description, if you miss something to answer either ask nicely, don't ask at all, or google it yourself.