The new Huber HR-30 tone ring is the result of the most extensive, scientific and detailed measurement of the acoustical properties of pre war tone rings ever performed.

This effort was far more sophisticated that Huber's earlier study, as it incorporated the analytical expertise of Dr. Jim Rae, a recently-retired research scientist with The Mayo Clinic. Rae made his mark with groundbreaking research into techniques for measuring the tiny currents that flow through individual protein molecules called ion channels many of which are involved in diseases of the heart, nervous system, hearing, vision and many other human organ systems. Many aspects of this research used techniques that are also used in physical acoustics.

After his retirement, Jim created a lab at his home to study the physical acoustics of 5-string banjos. He has published several papers and a book chapter in the scientific literature dealing with banjo vibrations and sound emission.

Jim, or "Doc Rae" as Huber calls him, had also developed a fascination with the banjo and agreed to use his gear to define the ways in which these special tone rings Steve had identified differed from the majority of pre wars. Rather than focusing on the formula of the alloy, Doc Rae studied the vibrational characteristics of these rings, as compared to other pre war rings, and the Huber Vintage Flathead ring. 

At the same time that Rae was analyzing the manner in which these rings vibrate, Huber was doing further investigation into the casting methods employed during the 1930s and early 40s. Their testing showed a strong correlation between these two factors, and after a great many test pours and repeated analysis, the HR-30 was born.

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