Yes, of course.
It's an old instrument, old technology (not that this makes it bad), and a relatively simple circuit being asked to do something reasonably difficult.
I just like to make the very best of what is available, and in this instance I have two of these TF1375s - one unrestored with completely original parts (which I will aim to restore to as close original as feasible), and a second devoid of any circuitry aside meter (which works) and range switches.
Not for here, but the latter one I would like to 'recreate' with some modern internals but keeping the original looks. Yes, I know that we wouldn't start from here, but it's an educational and fun project for me. If I really want to measure µV I'll use my Agilent bench DMM...