ADC QLM 30 MkIII (—)

Name: ADC 30 II
Brand: ADC

Not the star of the show, but the reliable stagehand that kept the record spinning on budget turntables for years.

Overview

Let’s be clear: the ADC QLM 30 MkIII—often referenced interchangeably in sources despite the “II” in the request—was never meant to be a high-fidelity revelation. It’s a moving magnet phono cartridge built like a small brick, designed for one unglamorous job: track records on inexpensive changers without skipping, arm lift after arm lift. Owners report it excelled at exactly that. This isn’t the kind of cartridge that makes you close your eyes and drift into the music. It’s not trying to. Instead, it’s a no-nonsense, heavy-tracking workhorse built to survive the daily grind of budget consoles and stack-loading changers, where reliability mattered more than nuance. The robust, heavy-tracking QLM30 was intended for inexpensive changers, and it worked quite well in that application. One user even mounted it on a BIC 920 changer inside a console and reported, “The combination worked perfectly.” Another ran it at 3 grams on a Sony PS-T2 and called it a day. That’s the world this cartridge lived in—functional, not magical.

Specifications

Type	moving magnet cartridge
Output Voltage	4,3mV bei 1kHz, 5cm/sec
Frequency Response	20Hz - 18kHz
Recommended tracking force	3g to 5g
Mass	5.75 g
Channel Separation	23 dB
Channel Balance	2 dB
Load Impedance	47k Ω
Stylus	RSQ 30
Stylus type	0.7 mil spherical (for the RSQ30 stylus designed for the ADC QLM 30 MkIII)

Key Features

Built for the long haul

Durability isn’t just a side benefit—it’s the core design philosophy. The QLM 30 MkIII was engineered to endure repeated use on record changers that cycled through albums all day, where cartridges took mechanical punishment from dropping tonearms and auto-return mechanisms. Its 5.75-gram mass and recommended 3–5 gram tracking force aren’t about finesse; they’re about staying planted. That high tracking force ensures the stylus doesn’t jump during arm lifts or stack drops, even on warped or slightly dusty records. It’s overbuilt by modern standards, but that’s the point: this cartridge was part of a system where failure meant downtime, and downtime wasn’t an option in a living room console meant for casual listening.

Stylus compatibility opens a backdoor to better sound

While the stock RSQ30 stylus is a 0.7 mil spherical tip—adequate but coarse—owners have found a workaround. It’s possible to swap in different styli that fit the same mount, including elliptical and nude spherical synthetic diamond variants. One user noted this can yield “better sound, much lower tracking weight (about 1g for the stylus from the ADC ZLM), and lower record wear.” That’s a significant upgrade path, effectively turning a utilitarian cartridge into something closer to a mid-tier performer. However, this requires sourcing compatible aftermarket styli carefully, as not all replacements are created equal. The existence of multiple replacement options—spherical at $23.42, elliptical at $47.82, and nude spherical synthetic diamond at $56.61—suggests a small but persistent demand for keeping these cartridges functional, even if the original design wasn’t audiophile-grade.

Collectibility & Value

The ADC QLM 30 MkIII has no original pricing or production years on record, and current market value for the cartridge alone isn’t tracked. However, context clues suggest it’s considered low-value hardware. A used Sony PS-T2 turntable fitted with this cartridge was picked up at an estate sale for $15, indicating the whole assembly trades as budget vintage gear. Replacement styli are available, with prices ranging from $23.42 for a basic spherical tip to $56.61 for a higher-end nude spherical synthetic diamond version. There’s no data on common failures or repair procedures, but given its simple moving magnet design and lack of delicate suspension, it’s likely that most units still function if the stylus is replaced. Collectors don’t seek it out for performance, but for completeness—restoring a vintage changer or console to working order. It’s a part, not a prize. And that’s okay. As one owner put it: “A workhorse phono cartridge built for durability and steady tracking on budget changers—don’t expect magic, but respect its purpose.”