ADC RXM-III Stylus ()
A precision elliptical diamond needle promising fine groove tracing and harmonically rich playback - if you can still find one
Overview
The ADC RXM-III stylus is sometimes listed as RXM III or RXMIII. It isn't a cartridge, and it isn't a full assembly. It's the needle itself, a replacement part for people who still run ADC's XLM series cartridges. The stylus is the last link in the analog chain. It's the tiny diamond that rides the spiral of a vinyl groove and turns the vibrations in it into sound.
The RXM-III is marketed as a replacement for the ADC ST XLM III phono cartridge and fits other models in the XLM series. The promise is "excellent tracing of record grooves" leading to "finer detail, clarity and harmonically complete sound quality." Elliptical tips like this were engineered to outperform the simpler conical shapes of earlier days. They make contact with more of the groove wall and retrieve more information, especially in the high frequencies. The "special elliptical" profile has scanning radii of .0003 x .0007 inch, which points to a diamond shaped for accuracy, not just longevity.
The modern replacement form uses a nude diamond tip. With a bonded tip, the diamond is mounted on a metal shank. A nude diamond is attached directly to the cantilever, which reduces mass and in theory improves transient response. Add the highly polished finish and it should mean less groove wear and cleaner signal retrieval. Whether that is audible or just peace of mind is something the original users might have debated. Replacements are still being made, so some demand is still out there.
Specifications
| Manufacturer | ADC |
| Product type | Replacement stylus (needle) for a phono cartridge |
| Stylus tip shape | Highly polished special elliptical diamond |
| Stylus tip construction | Nude diamond |
| Scanning radii | .0003 x .0007 inch |
| Country of manufacture (for this replacement) | Japan |
Collectibility & Value
As of current listings, a replacement ADC RXM-III stylus sells for $73.00 USD. The price appears consistent across multiple online vendors specializing in turntable parts, which suggests a stable niche market. The original production years and pricing remain unconfirmed, so today's price reflects the cost of maintaining aging equipment, not vintage collectibility. There is no data on common failures or maintenance issues specific to the original RXM-III stylus, and no verified reports of wear patterns or alignment challenges.
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