ADC QLX-3 ()
The ADC QLX-3 is a phono cartridge built to trace the groove and stay out of the way.
Overview
The ADC QLX-3 is a phono cartridge with one job: tracing vinyl grooves accurately. Not much documentation survives. According to retailer LP Tunes, the replacement stylus for this cartridge delivers “superior tracing of record grooves along with preserving the life of your records, and results in superbly accurate reproduction of recorded voice and music.” That is a present-day claim from a vendor still supplying parts for this obscure model, not a line from a vintage ad campaign.
Almost all we can say for certain is that the QLX-3 was built around a high-precision stylus. It's a “special elliptical diamond” tip, with scanning radii of .0003 x .0007 inch. It pairs that with a thin-wall metal alloy cantilever, which aims to minimize resonance and distortion.
The replacement stylus for the QLX-3 also fits the ADC RSX, another model in ADC's line of cartridges. That cross-compatibility hints at a shared lineage or design platform within ADC's lineup, though the broader product family tree is undocumented. For owners hunting parts today, one stylus serving multiple models improves the odds of keeping these players spinning.
Beyond the stylus and cantilever, the QLX-3 goes quiet. There are no production years, no original pricing and no technical benchmarks. Tracking force, output voltage, compliance and frequency response are all missing, and those are the specs that normally anchor a cartridge discussion. Weight and dimensions are missing too. The cartridge survives mostly through replacement parts and niche retail listings.
The fact that a replacement stylus exists, and is marketed for its groove-preserving accuracy, suggests the QLX-3 was built with care, perhaps for listeners who valued record longevity as much as sonic detail. It may never show up on vintage audio hall-of-fame lists, but it matters to anyone matching a stylus to a worn-out cartridge on a shelf-find turntable.
Specifications
| Manufacturer | ADC |
| Product type | phono cartridge |
| Stylus tip shape | special elliptical diamond |
| Stylus tip dimensions | .0003 x .0007 inch scanning radii |
| Cantilever material | thin-wall metal alloy |
Collectibility & Value
The ADC QLX-3 does not appear in collector markets as a complete cartridge with documented resale value. A replacement stylus branded by LP Gear is currently available for $36.95 USD, a price confirmed across retail listings. That cost reflects ongoing support for the model in the replacement parts ecosystem, though it says nothing about the original cartridge's rarity or desirability. Since the stylus also fits the ADC RSX, demand may be sustained by compatibility rather than the QLX-3's individual reputation. No data exists on common failures, repair complexity, or maintenance beyond stylus replacement, so owners are left with general cartridge servicing practices.
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