Jack Stanley and Brett Hart reveal a revolutionary method for restoring Edison diamond disc reproducers using coin holders. Their innovative technique transforms the sound quality of century-old phonographs by addressing "reproducer arthritis" and bringing back vibrant audio reproduction that rivals or exceeds the original factory performance.

• Coin holders designed for collecting can be repurposed to revitalize Edison diamond disc reproducers
• The modification requires cutting and fitting the coin holders alongside appropriate gasket material
• Leaving a controlled air leak in the reproducer enhances bass response and works as a tone control
• This technique works on multiple types of Edison reproducers including B, C, H, and K models
• The restored reproducers produce dramatically improved sound quality with enhanced clarity and bass
• Materials needed are inexpensive – approximately $5 for enough coin holders to rebuild multiple reproducers
• Both inventors are available to help collectors attempt this restoration ([email protected] and [email protected])
• Special tribute to Eric Reiss, author of "The Complete Talking Machine," who recently passed away at age 71