[morzh]

The potentiometer needs to be checked. It is a very simple check., just measuring end-to-end and comparing it to the required value (it could be within limits, way out of limits, or even open) and then, IF the end-to-end is usable (even if you have 2x the value but no open, it is usable), checking the wiper operation (going from low to high value when rotated, without any interruption).
If satisfactory, it then could be gently dusted with a can of air, and lightly sprayed with F5 (important !!! not D5 or any contact cleaner) Deoxit or a well-regarded taper lube/volume pot cleaner, let dry and then re-checked.

Your pot has cylindrical resistor band inside and a roller-type brass wiper.

As long as the pot is continuous end-to-end (ecven if it is 1M or so) it should work. If your 70K resistor is, as you wrote, 80 (I think you meant 80K, as you wrote "a reading of 80 ohms") and not 70K, while it is OK, but the low volume is too high, you might try to variate the #33 to lower values until you find one that works best for you.

Also make sure this is the case with every station and not just with the strongest local station as often times with older radios (though they used a bit different volume control scheme) that station might come through even with the volume turned all the way CCW. In which case I would leave it be.