ADC QLM-36 MKIII

Name: ADC QLM-36 MKIII
Brand: ADC

A replacement stylus that keeps a forgotten ADC cartridge singing—polished elliptical diamond, tight radii, and claims of harmonic richness, if not a full spec sheet.

Overview

The ADC QLM-36 MKIII isn’t a cartridge you stumble upon in a vintage shop with any regularity—it’s more of a ghost in the analog world, known today almost exclusively through its replacement stylus. What we do know is that ADC, the audio-focused manufacturer (not to be confused with the medical company of the same initials), built a reputation on moving magnet cartridges, particularly the revered XLM series. The QLM-36 MKIII appears to be part of a broader QLM line, joining siblings like the QLM-30 MKIII, QLM-32 MKIII, and QLM-34 MKIII, though its exact place in that family tree remains murky. Unlike the XLMs, which often get name-checked in audiophile circles, the QLM series sits in the background—functional, likely well-engineered, but never achieving the same cult status. The product as it exists today is not the original cartridge but a modern replacement stylus, sold by third-party vendors like LP Gear and LP Tunes, aimed at keeping older ADC owners up and running without hunting for NOS (new old stock) parts.

This is a component-level relic: the needle, not the whole assembly. And while that might sound like a footnote in the grand book of vintage audio, for someone with a working ADC deck or tonearm setup, it’s the difference between spinning records and staring at a silent turntable. The fact that replacement styli are still available speaks to either a loyal user base or a smart aftermarket betting on longevity. Either way, it means the QLM-36 MKIII lives on, not as a showpiece, but as a working part in someone’s system.

Specifications

Manufacturer	ADC
Stylus tip shape	highly polished special elliptical diamond
Stylus tip radii	.0003 x .0007 inch
Cantilever material	thin wall aluminum alloy

Key Features

Elliptical diamond with precision radii

The stylus uses a highly polished special elliptical diamond tip, a shape designed to make more intimate contact with the record groove than a conical stylus. With tip radii of .0003 x .0007 inch, it’s built to trace high-frequency information with less distortion and wear—assuming your records are clean and your setup is dialed in. The “special elliptical” designation suggests it may not follow a standard elliptical profile, possibly optimized for a particular compliance or tracking envelope, though no supporting data exists to confirm this.

Aluminum alloy cantilever

Bonded to that diamond is a thin wall aluminum alloy cantilever, a material choice that balances stiffness and low mass—critical for accurate high-frequency response and minimizing resonance. Aluminum is less exotic than boron or ruby rods seen in high-end cartridges, but it’s a sensible, cost-effective pick that was widely used in mid-tier moving magnet designs. The “thin wall” construction implies an effort to reduce mass further, which should help with transient response and tracking agility.

Performance claims

Vendors describe the stylus as delivering “superb tracking and tracing of record grooves,” a claim that hinges as much on proper alignment and tonearm setup as on the stylus itself. More subjectively, it’s said to produce “finer detail, clarity and harmonically opulent sound quality” (LP Tunes) or “finer detail and harmonically complete sound quality” (LP Gear). These are marketing phrases, to be sure, but they point to an intended sonic character—detailed without being harsh, rich without bloat. Whether the original cartridge design fully realized that promise is unknown, but the emphasis on harmonic completeness suggests ADC aimed for a natural, full-bodied presentation.

Collectibility & Value

The ADC QLM-36 MKIII isn’t traded as a vintage collectible in the traditional sense. There’s no data on original pricing, production years, or current resale value for the full cartridge. What *is* available is a modern replacement stylus, priced at $36.95—a figure that reflects its niche aftermarket status rather than collector demand. For context, an alternative original-style stylus, the ADC RS-Q36 (or RSQ36), lists for $69.95, nearly double the cost, suggesting it may use a different diamond profile or mounting system, or simply commands a premium as a more direct OEM-equivalent part. No information exists on common failures, wear patterns, or maintenance issues with the original cartridge, leaving owners to rely on general moving magnet troubleshooting if problems arise.