Tektronix at one time bought out Telequipment and it was a wholly-owned subsidiary of Tek. I don't know if they still keep up on the microfiche distribution of their manuals, but the Telequipment line, if the paper manuals were no longer available, were available on microfiche.
https://www.tek.com
Only the top-end TQ scopes had a trace rotation adjustment. All others had to have the CRT loosened in the back and rotated. This can be a bit testy, as a lot of times, the CRT socket glued itself into the clamp and made rotation difficult without disassembling the back end of the thing and breaking it loose. Yes, you do have to be careful of the high voltage, but it's pretty difficult to rotate the CRT and know where you are without the scope running and the calibration procedure will have you do it that way. Doing it with the power off is a very hit-and-miss operation and will take you 200 attempts to get it right -- not only that, but the very act of retightening the clamp usually moves the rotation just a little bit.
RV92 - BLKG This will be the blanking adjustment and without the calibation procedure, you won't be able to set it correctly. If you have a good trace and can't see the retrace, I wouldn't worry about it.
RV88 - IPS I don't recognize or remember this one.
RV6 - SET Y GAIN If you have a KNOWN ACCURATE vertical voltage input, this trimpot will adjust the vertical gain of the scope so that it reads correctly. If you don't know how accurate your source is, then don't mess with it. But a DMM measuring a sine wave off the secondary of a transformer and then calculating the peak-to-peak value (two times RMS times the square root of 2) will give you a short-term accurate voltage, although it may be a hard value to read on a scope display.
RV72 - TIME/CM If you have a know accurate frequency (10KHz is about the best), then adjust this trimpot at a sweep speed of 1ms/DIV so that you have one complete square wave for each division. A 1KHz frequency will give you one squarewave over the entire 10 divisions, but that isn't as telling a display as it doesn't take into account the non-linearity that all scopes have at the extremes of the display.
RV48 - Trig SENS This adjusts the triggering circuit for the best sensitivity. You need the manual to get this one right, too. If a trigger is adjusted so that it isn't very sensitive, then it'll be difficult to trigger the scope on small signals. On the other hand, if it's too sensitive, then it'll trigger on anything that comes around so that even the smallest amount of noise on an audio signal will keep the scope from triggering solidly.
You CAN tell the difference if a scope is off by 5% vs. 0.5%. A 5% error with a six-division signal (whether time or amplitude) will give you an error of 1.5 minor divisions which can be disturbing if you have a known-accurate signal. A 0.5% error would give you a 0.15 minor division error which is about a trace-width on a TQ scope. Bear in mind that the low-end TQ scopes are rated for an accuracy of no better than 3% and may be as bad as 5%. But those are specifications. A typical Tektronix scope with a spec of 3% was usually better than 1% after sitting around for 5 years with no calibration and 0.5% right after a fresh calibration.
Dean