Ralph is a fine callmaker as well!
I have 1917 and model 45 trumpets from him that are excellent.
If we are talking $150 plus calls like Ralph's, I would add Matt Mcclain, Frank Cox, Herb Hornstra, Frank Hiegler, Billy Buice to the list as excellent trumpet call makers (I am sure there are others but these are ones I have experience with).
For $50 I think Tim is one of the best out there.