I don't know about the 102, but I can tune up my 101 easily with a tw1.
It has been a long time since tube theory, but how would underloading harm
the tubes? I really don't think you would hurt anything, if you are
loading to heavy, the dip is harder to find. I never did get hands on a
102, so don't know the radio.
73
Butch
WA0VJR
Node 3148
Wallace, ks.