Jared, is this the PG502 pulse gen or PG506 calibration gen?
if a CAL gen with high speed edges, I suggest to NOT change any resistance or cap in the fast pulse output section
In our work, since 1970s, carbon comp and carbon film resistance fail with
a/ over dissipation
c/ mechanical stress eg on leads
They dont fail during normal use, very reliable.
Just the ramblings of an old retired EE