I love that '20's saxophone sound but I've never been able to achieve it. I think "their" secret was in the mouthpiece and not the pads/resos. Like was posted before, the absence of resonators in saxophones was the way it was done then. So that wonderful old saxophone sound of Weidoeft, Stump Evans, early Hawkins, and all the alto players of the jazz-age came from vintage mouthpieces with fairly closed tips and fairly hard reeds.
Unless you are willing to go that mouthpiece/reed route, I'd suggest you either leave your saxophone alone and just play it, OR re-pad with typical resonators being used now (like the domed metal, semi-domed plastic, or the wavy-like Noyeks). I have vintage and current saxophones with all three types of resonators (plus one vintage with no resonators) and I don't think it matters what style of resonator you choose. I realize some may claim there is a difference but they can't prove it - their samples are from one or two horns. It would require hundreds of re-pads and reso changes before the tonal effect could be objectively shown. DAVE