ADC QLM-36 MKIII ( )

Name: ADC QLM-36
Brand: ADC

That whisper-fine trace of a diamond riding the groove like a tightrope walker—this is where analog detail starts to breathe.

Overview

The ADC QLM-36 MKIII isn’t a full cartridge you’d mount on a headshell fresh out of the box—it’s the business end of one: a replacement stylus, the actual needle that makes contact with your vinyl. But don’t let that diminish its importance. For owners of the original moving iron stereo phono cartridge, this is the critical component that defines clarity, tracking, and longevity. ADC built a reputation on precision, and while their XLM series often steals the spotlight, the QLM-36 MKIII sits just beneath it, sharing DNA with those higher-end models but with a voice all its own.

What’s especially interesting—and a little clever—is that the cartridge body used for the QLM 36 MKIII is the same one found in the more revered XLM, ZLM, and ASTRION models. The difference? The stylus. That means you’re getting a high-quality mechanical platform, just paired with a slightly more modest (though still highly capable) diamond profile. It’s a smart tiering strategy: same robust housing, different sonic tuning. And according to forum reports from long-time ADC users, the company adjusted the inductance of these bodies over time, which in turn influenced how the styli were voiced. So even if the body looks identical, the electrical behavior evolved—something subtle you might not notice on paper but could hear in the warmth or articulation of the midrange.

ADC, as a brand, remains a cult favorite among analog diehards. Their moving magnet and moving iron cartridges from the golden era are often described as undervalued gems—especially given how well they track and how richly they render harmonics. The QLM-36 MKIII fits squarely into that legacy, offering a path into ADC’s sound without the premium price tag of the XLM line.

Specifications

Manufacturer	ADC
Product type	Stylus (needle) for a cartridge; moving iron stereo phono cartridge
Stylus tip shape	Special elliptical diamond
Stylus tip radii	.0003 x .0007 inch
Cantilever material	Thin wall aluminum alloy

Key Features

Highly Polished Special Elliptical Diamond

The stylus tip itself is a "special elliptical diamond"—a shape engineered to maximize contact with the groove walls, pulling out more detail than a standard elliptical would. It’s not a line contact or Shibata, but it’s a step above basic elliptical profiles, especially given how finely polished it is. According to LP Gear, whose replacement version carries this exact spec, the finish on the diamond contributes directly to finer detail retrieval and a more harmonically complete sound. That’s not marketing fluff—it’s the kind of nuance you notice in the trailing edges of cymbals or the breath behind a vocal.

Shared Cartridge Body with Flagship Models

One of the most compelling aspects of the QLM 36 MKIII setup is that it uses the same cartridge body as ADC’s higher-tier XLM and ZLM models. This isn’t just about looks; it means you’re benefiting from the same rigid, well-damped housing that helps minimize resonance and tracking error. The engineering investment is already there—the body is a known quantity. All that changes is the stylus assembly, which allows ADC to offer a more accessible entry point into their ecosystem. For tinkerers and upgraders, this opens the door to potential swaps or refinements down the line.

Inductance Tuning and Stylus Voicing

As ADC refined these cartridges over time, they reportedly increased the inductance of the bodies. This isn’t just an electrical footnote—it affects how the cartridge interacts with your phono stage and, by extension, how the stylus performs. Adjusting inductance alters the frequency response and transient behavior, effectively allowing ADC to "voice" different styli to match different bodies or target different sonic characteristics. So while the QLM-36 MKIII might share a body with a ZLM, it’s not just a downgraded version—it’s a deliberately tuned alternative, shaped by both mechanical and electromagnetic design choices.

Collectibility & Value

Replacement styli for the QLM-36 MKIII remain available today, though not at bargain-bin prices. The LP Gear version—a genuine replacement stylus—lists for $36.95, while an original ADC RS-Q36 stylus is priced at $69.95, suggesting a premium for factory authenticity. Aftermarket options across Europe range from €21.90 to €80.92, indicating variability in sourcing and perceived quality.

On the used market, complete cartridges are showing up with modest but steady interest. A used ADC QLM36MkII cartridge was listed for $129 on eBay in October 2024, and a QLM 36 MKII with headshell went for $150 in February 2025. An original ADC QLM36 MkIII (Grey) genuine replacement diamond stylus was listed for £52 in March 2025. These aren’t sky-high prices, but they reflect a quiet demand—especially among those who already own ADC gear and know how hard it can be to find compatible, high-quality replacements.

Collectors should note that while ADC cartridges are considered undervalued gems, the QLM-36 MKIII doesn’t carry the same cache as the XLM series. Still, its shared architecture with those models makes it a smart buy for someone looking to experience ADC’s engineering without paying top tier. Just be mindful: original stylus assemblies on these older cartridges can be fragile, and tracking issues or worn tips can degrade performance fast. If you’re buying used, verify the stylus condition—or budget for a replacement.