Ortofon Stylus D25M Replacement Stylus

The Ortofon Stylus D25M is a special stylus for mono microgroove records – for collectors who want to hear mono pressings from the 1950s and 60s the way they were originally meant to sound.

Why this replacement stylus?

Early mono microgroove records have a different groove geometry than later stereo pressings. A larger spherical tip with a 1 mil radius (25 µm) tracks the groove at the point with less wear from decades of playback with stereo styli – this reduces noise and brings back bass and clarity noticeably.

Who it's for (in plain terms)

For anyone with a sizeable mono collection from the 50s and 60s. For pure stereo collections, this stylus isn't the right choice.

Technical Data

• Stylus shape: spherical, R 25 µm (1 mil), for mono microgroove records
• Compatible with: Super OM, OM, OMP, TM and Concorde systems
• Mounting: plug-in stylus replacement, no tools needed

Frequently Asked Questions

What does a mono stylus offer over a normal stereo stylus?
It reads the groove at a less damaged spot, noticeably reducing surface noise, with clearer bass and less distortion on old mono pressings.

Do I also need a mono switch on my amplifier?
Recommended, yes – it additionally suppresses noise components that only appear on one channel.

Why buy replacement styli from HD Zürisee?
We're happy to advise you on the complete mono playback chain for your historic collection.

Goes well with

The Stylus 78 for even older shellac records in the 78 rpm format.

Questions about your mono collection? Call us (+41 44 680 22 00) or message us on WhatsApp (076 534 22 00).