ADC QLM31 Mk III ()

A no-frills moving magnet cartridge built for budget turntables of its era - simple and replaceable

Overview

The ADC QLM31 Mk III didn't aim for glory. It tracked a groove without costing much. Audio Dynamics Corporation (ADC) was better known for its higher-end XLM and ZLM lines, and the QLM31 Mk III sits on the lower rungs of the ADC family tree. It's a phono cartridge made to plug into entry-level turntables and get the job done. No exotic materials, no high-output tricks, no cult following.

Owners report that the QLM series was "a nice cartridge suitable for lower end turntables like the BSR and Garrard changers that were common at the time." These weren't audiophile decks. They were record changers stacked under consoles in suburban living rooms, spinning 45s and LPs with all the finesse of a cafeteria tray slide. The QLM31 Mk III was reliable enough, easy to mount and affordable. It likely came paired with a headshell, since one listing offers a used QLM31 Mk III with a new diamond stylus and new headshell. That suggests it was often sold as a complete, ready-to-install unit.

The exact specs haven't surfaced. No tracking force, output or frequency response data has turned up. We do know where it stood in the ADC hierarchy. According to user recollections, "the ZLM was the top of the line followed by the XLM III, and/or XMM Improved, then QLM, QLM Improved." That puts the QLM31 in the value segment, a step below the models collectors now chase. It was meant to be replaced, not cherished, which is probably why so few details survive. The cartridge cost a fraction of the turntable, and nobody saved the spec sheet.

Specifications

Manufacturer	ADC (Audio Dynamics Corporation)
Product type	Phono cartridge
Exact product name	ADC QLM31 Mk III

Historical Context

The QLM31 Mk III sat in the shadow of ADC's more celebrated lines. It was a practical option for budget-conscious buyers in an era when automatic turntables dominated living rooms. It was part of a broader QLM series, including the QLM 30, 31, 32, and up to 36, aimed at entry-level playback. These cartridges were designed to work with common changers from brands like BSR and Garrard, where durability and ease of use mattered more than sonic nuance. Within ADC's lineup, the QLM series sat below the XLM and ZLM models, which were positioned as higher-performance alternatives.

Collectibility & Value

The ADC QLM31 Mk III doesn't command attention in today's vintage audio market. It's not rare, not revered, and not particularly sought after. One listing shows a used QLM31 Mk III cartridge offered with a new stylus and headshell, which suggests it still circulates among tinkerers and turntable restorers. That listing gave no price, but a user reported buying a similar model, the ADC QLM 34 MkIII, with stylus for $20. That's a rough benchmark for what these cartridges go for when they do appear. They aren't collectible in the traditional sense, but they're useful as a functional, period-correct replacement for someone restoring a vintage changer on a small budget.

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Service Manuals, Schematics & Catalogs

Catalog (1989) — archive.org
Catalog — archive.org