Audio-Technica - AT33xMONO/I - True Mono Dual Moving Coil Cartridge

Built for classic mono records. The Audio-Technica AT33xMONO/I is a True Mono dual moving coil cartridge whose coils respond only to horizontal groove movement, cutting out vertical noise for a clean, centred mono image. A 0.65 mil conical nude stylus on a duralumin pipe cantilever, PCOCC coils at the fulcrum, a neodymium magnet, and a composite body with a die-cast zinc base to disperse resonance. Suitable for mono and stereo records.

A Cartridge Dedicated to Mono

Mono records carry their information in the horizontal movement of the groove. A stereo cartridge also reads the vertical movement, which in a mono pressing is just noise from groove wear, light damage and surface imperfections. The AT33xMONO/I is designed to ignore it.

It is built on the AT33x Series platform and brings the series' die-cast zinc body and dual moving coil architecture to dedicated mono playback. It is aimed at collectors of mono pressings, vintage jazz, classical and early rock, and at anyone building a growing mono shelf.

True Mono Dual Moving Coil

The AT33xMONO/I uses a True Mono dual moving coil design, with its PCOCC (Pure Copper by Ohno Continuous Casting) coils arranged horizontally and positioned at the cantilever's fulcrum. The generator produces a signal only from horizontal groove movement, so the output is unaffected by vertical modulation. The result is reduced surface noise, a stronger low end and a cleaner, more solid centred mono image than a stereo cartridge summed to mono. A neodymium magnet provides clean, dynamic signal transmission.

Compliance remains appropriate in the vertical plane, so the cartridge can also be used safely on stereo records. Because it has two coils, it connects to a stereo system and delivers authentic mono reproduction through both channels.

0.65 mil Conical Nude Stylus on a Duralumin Cantilever

A 0.65 mil nude conical stylus is purpose-built for the consistent width and depth of mono record grooves, giving faithful tracking and natural sound. It is mounted on a rigid duralumin pipe cantilever that tapers toward the stylus tip for improved response, linked to a firm suspension mechanism that slightly lowers the dynamic compliance.

A Composite Body That Disperses Resonance

Like the rest of the AT33x Series, the body combines die-cast zinc, aluminium and high-rigidity polymer, arranged to minimise and disperse resonance and vibration throughout the cartridge. The result is an even, natural tonal balance without frequency coloration, with lifelike mid-to-low frequencies.

Easy to Mount

Threaded mounting holes make it easy to fit to most headshells and tonearms. A non-magnetic screwdriver, brush, washers, mounting screws in three lengths and a protector are all included.

Please Note

At 0.42mV output the AT33xMONO/I is a low-output moving coil cartridge, so it needs a phono stage with an MC input, or a step-up device.

Feature Cards

🎙️ True Mono — Horizontal Signal Only

Horizontally arranged coils respond only to horizontal groove movement, so vertical noise doesn't reach the output. Cleaner mono playback with reduced surface noise.

💎 0.65 mil Conical Nude Stylus

Purpose-built for the consistent width and depth of mono grooves, on a tapered duralumin pipe cantilever for faithful tracking and natural sound.

🧲 Dual PCOCC Coils at the Fulcrum

Pure Copper by Ohno Continuous Casting coils positioned at the cantilever's pivot, with a neodymium magnet, for untainted horizontal signal transmission.

🛡️ Die-Cast Zinc Composite Body

Die-cast zinc, aluminium and high-rigidity polymer disperse resonance for a balanced, natural tonal character. Safe on both mono and stereo records.

Editorial Blockquote

"A True Mono dual moving coil design that eliminates vertical groove noise." — Audio-Technica AT33xMONO/I

At-a-Glance Bullets

• AT33x Series True Mono dual moving coil (MC) cartridge
• Signal from horizontal groove movement only — unaffected by vertical modulation
• Stylus: nude conical, 0.65 mil
• Cantilever: duralumin pipe, tapered toward the stylus tip
• PCOCC (Pure Copper by Ohno Continuous Casting) coils positioned at the cantilever fulcrum
• Neodymium magnet
• Composite body: die-cast zinc, aluminium and high-rigidity polymer
• Suitable for mono and stereo records
• Threaded mounting holes — standard half-inch mounting
• Output voltage: 0.42mV (1kHz, 5cm/sec, horizontal signal)
• Frequency response: 20–30,000Hz
• Tracking force: 2.0–2.4g (2.2g standard)
• Vertical tracking angle: 20°
• Horizontal/vertical output ratio: 25dB (1kHz)
• Recommended load impedance: ≥ 100Ω (when head amplifier connected)

Specifications

Closing Quote

"One groove. One channel. All the weight of the original session. The Audio-Technica AT33xMONO/I — a dedicated home for your mono collection."