ADC QLM33 MkIII

A parts-bin cartridge with a contested stylus - the one you find while hunting for its stylus, not the other way around.

Overview

The ADC QLM33 MkIII is a phono cartridge with a replaceable stylus. It belongs to ADC's QLM-series lineup, and it was sold as a complete cartridge originally fitted with a new stylus. In some European listings the whole assembly is called a "cellule." That sounds more exotic than a modest cartridge is.

There are no ADC spec sheets for this one, no manuals, no archived reviews. Nothing settles the basic question of what stylus it actually shipped with. It sits in the QLM-series lineup alongside the 30, 32, 34, and 36 MkIII models, and it shares stylus compatibility with the ADC Series RQ and RSQ 30, 32, 34, and 36 cartridges.

Key Features

The Stylus Question: Elliptical or Conical?

The stylus is where it gets frustrating. LP Gear, one of the more reliable retailers of vintage phono parts, describes it as a "special elliptical diamond," highly polished. An elliptical tip traces high-frequency groove modulations better than a conical one. But a Vinyl Engine forum post, referencing a new-old-stock unit, flatly contradicts that: "There is no elliptical version of the QLM33," the poster insists, claiming it used a 0.7 mil conical stylus instead. Both claims are out there, and no manufacturer documentation survives to referee the dispute. Buyers should be skeptical of any listing that promises an elliptical tip and ask for evidence.

Replaceable Stylus and Modular Compatibility

The replaceable stylus is the design's saving grace. A cartridge with a worn or broken tip is landfill, while one that accepts a fresh stylus stays in service. The QLM33 MkIII's stylus compatibility with the RQ, RSQ 30, 32, 34, and 36 cartridges means the parts pool is wider than the model's obscurity would suggest. If you own one of those siblings, a stylus sold under the QLM33 name may still fit. Given the elliptical-versus-conical confusion, "fit" and "match" aren't necessarily the same thing.

Historical Context

The QLM33 MkIII belongs to ADC's QLM-series lineup, which included the 30, 32, 34, and 36 MkIII models. Beyond that, the historical record is essentially blank: no production years, no launch documentation. The cartridge has been described as "a footnote that refuses to fade" in vintage turntable lore, and as "a parts bin legend." It's the thing you dig out of a box because it might still work, or because someone needs the stylus.

No archived reviews in Stereo Review or Hi-Fi News have surfaced to settle the stylus debate. A brief listing in HiFI-Stereo (1982, p.95) is the closest thing to period coverage found, and it offers only a catalog entry rather than an evaluation.

Collectibility & Value

The demand is for the stylus, not the body. A genuine replacement diamond stylus has been listed at $39.95 from LP Gear. A "Genuine Original Replacement Diamond Stylus" appeared on HifiShark for £52 on March 16, 2025, while another sold for £34 back in December 2021. An eBay shop once asked $68.08 for a "Grey" version, and a French seller listed a complete "Cellule ADC + diamant original elliptique neuf" for €80.00, a premium that presumably reflects the sealed, original-elliptical claim.

For the full cartridge in used condition, expect roughly £35 to £65 on eBay based on recent listings. That spread reflects condition, but also uncertainty: is the stylus elliptical or conical? Was it tested, or just described as such? One seller's endorsement - "tested on my personal turntable" - is about as much verification as this cartridge ever gets. No documented common failures or maintenance tips specific to the QLM33 MkIII have surfaced. Forum chatter about other QLM models, particularly the 32 MkIII, mentions suspension softening in early versions, but that's a warning from a sibling, not a confirmed flaw here.

eBay Listings

ADC QLM33 vintage audio equipment - eBay listing photo 1

ADC RSQ33 Stylus / QLM33 III Tonar Box Set for RQ RSQ 30 32

$55.07

See all ADC QLM33 on eBay

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