Still wont touch a Beard approved GOld Tone tho, for tone. The Premier Guitar Review READ LATEST ISSUE NOW! The Regal Dobro Resophonic Guitar Model 37, built in Chicago during 1935 has been functionally restored by Grant MacNeill. The Regal is designed around a custom bifilar output transformer that is essentially two discrete transformers driving a common speaker load.All metal parts are heavily nickel-plated, 1 day ago The MM BLUES '28 is a single cone biscuit-bridge resonator guitar based on the original 1928 wood-bodied Triolian.