ADC RLX-III (Unknown Years)
That moment when the needle settles into the groove and you forget it’s even there—that’s the promise of a good stylus, and the ADC RLX-III aims to deliver silence so clean, the music feels alive.
Overview
The ADC RLX-III isn’t a cartridge, it’s not a turntable, and it certainly won’t sit on a shelf as a conversation piece. But if you own—or have stumbled into—the niche world of vintage phono cartridges, this tiny sliver of polished diamond might be exactly what’s keeping your records sounding honest. It’s a replacement stylus, specifically designed for the ADC LX-III (or LXIII) phono cartridge, a model that doesn’t show up in every ADC catalog but still lingers in the corners of forums and repair shops like a quiet rumor. The RLX-III is the business end of that setup: the part that actually rides the groove, translating decades-old vinyl undulations into something your amp can understand.
Manufactured by this stylus carries a designation that sounds more like a secret project than a consumer part. But don’t let the Roman numerals fool you: there’s no grand lineage spelled out in brochures or service manuals. In fact, one vinyl forum notes that the ADC LX-III “seems to not be a standard part of the ADC line-up,” which means if you’ve got one, you’re either deep in the weeds or lucky in the thrift store. The RLX-III exists to keep that oddball cartridge alive, and it does so with a “highly polished special elliptical diamond” tip—engineered, presumably, to dig deep into the groove walls without tearing them up.
Owners report that the replacement stylus offers “excellent precision tracing of record grooves and accurate rendition of voice and music,” which, for a part smaller than a grain of rice, is about as glowing a review as you can get. It’s not about flash or hype; it’s about trust. You drop the tonearm, the needle finds the lead-in, and if you don’t hear a pop, a skip, or a smear—just music—then the RLX-III did its job. That’s the quiet victory of a good stylus: when it disappears.
Specifications
| Manufacturer | ADC |
| Product Type | Replacement needle stylus for a phono cartridge |
| Stylus Tip Shape | Special elliptical diamond |
| Stylus Tip Scanning Radii | .0003 x .0007 inch |
| Compatible Cartridge | ADC LX-III (or LXIII) phono cartridge |
Collectibility & Value
The ADC RLX-III doesn’t trade in nostalgia or display value—it’s a functional part, and priced like one. As of the latest listing from LP Gear, the replacement stylus runs $73.00. That’s not cheap for a needle, but then again, you’re not buying just any tip. You’re buying a precisely shaped, highly polished diamond engineered to match the original specs of a semi-obscure cartridge. For collectors maintaining a vintage setup, this isn’t an upgrade—it’s a necessity. There’s no data on original pricing, production years, or common failure modes, so buyers are left relying on current vendor descriptions and the quiet consensus of those still running ADC gear. If your LX-III cartridge still works and you can’t find a modern equivalent that tracks quite right, the RLX-III might be the only path back to silence between the notes.
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