Ortofon 540 MKII Replacement Stylus

The Stylus 540 MkII — An FG 70 Diamond for the 500-Series Bodies

Ortofon's replacement stylus for the 500-series, sold singly. The company states it plainly: this is the “stylus 540 MkII for the MM 540 MkII, 540, and Mojo.” Three bodies, one part.

What sets it apart from anything in the OM or 2M ranges is the diamond itself. Ortofon specifies a nude FG 70 profile at a 5/70 µm radius — the narrowest leading edge and the longest contact line of any stylus we list.

Fit, Profile and Compatibility

Which Bodies It Belongs On

Ortofon lists three: the MM 540 MkII, the 540 and the Mojo. If your cartridge is one of those, this is the matched replacement and no other part substitutes for it.

The 500-series mount is its own. An OM, 2M or Concorde Music stylus is not an alternative here, and this one is not an alternative on those bodies — the ranges do not cross over in either direction, whatever fits physically.

The Numbers That Matter at Setup

The FG 70's 5 µm leading radius is finer than the 8 µm used across the OM and 2M ranges, and its 70 µm side radius is longer than any of them. Ortofon quotes 22 µm/mN compliance, tracking ability of 80 µm at 315 Hz, and 20 Hz – 20 kHz within +2/–3 dB.

Tracking force runs 1.25 to 1.75 g with 1.5 g recommended. A profile this fine reads a narrow band of the groove wall, so vertical tracking angle and arm height matter as much as the weight does.

Who Is the Stylus 540 MkII Best For?

• You own an MM 540 MkII, a 540 or a Mojo — Ortofon names all three for this stylus
• Your tip is worn — the body and its generator are unaffected by tip wear and carry on
• You want the FG 70 geometry back — a 5/70 µm radius is what these cartridges were built around
• Your arm is adjustable for height — this profile repays getting vertical tracking angle right
• You own an OM, 2M or Concorde Music cartridge — this is not the one for those; the 500-series mount is separate, and their styli are in replacement styli

How Do You Fit It?

Leave the cartridge on the arm. Take the old assembly off the front of the body, press the new one on until it seats, and reset tracking force to 1.5 g. Then check the arm sits parallel to the record — with a 5 µm leading radius, a tilted cartridge is audible.

Pairs Well With

What most 500-series owners shop alongside.

• Stylus force gauges — how you set the 1.5 g this one asks for
• Cartridge alignment tools — for the day the whole cartridge comes off
• Stylus cleaning — what decides how long the new tip lasts
• Record cleaning solutions — a clean record is the cheapest stylus insurance there is

Frequently Asked Questions

Will it fit my cartridge?

Ortofon lists it for the MM 540 MkII, the 540 and the Mojo. Those three share a mount that the OM, 2M and Concorde Music ranges do not use, so nothing crosses over in either direction.

What is an FG 70 profile?

It is Ortofon's fine-groove geometry: a 5 µm leading radius with a 70 µm side radius. The narrow front reads high-frequency detail; the long side spreads contact up the groove wall.

What tracking force should I set?

Ortofon specifies 1.25 to 1.75 g and recommends 1.5 g. Set arm height at the same time — this profile is the most sensitive to vertical tracking angle of anything in the range.

How long does a stylus last?

Around 1,000 hours is the usual figure, though it turns on how clean your records are and how accurately the cartridge is set up. A worn tip damages records, so replace it on schedule rather than by ear.

See It in Action

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