The Ortofon OM78 phono cartridge is designed to correctly track and trace 78 RPM record grooves. It renders 78 RPM recorded music the way it was meant to be heard—with the natural clarity and harmonic rightness that Ortofon is world-renowned for. This is the reason why the OM78 is an established product in Europe.
R 65 µm (2.5 mil)Spherical Bonded Diamond stylus for 78rpm & Shellac records ( for the playback of early 65 µm mono and 78 rpm recordings )
Ortofon OM78 78 RPM Phono Cartridge Specifications
- Output voltage @ 1kHz, 5cm/sec: 4mV, lateral (mono)
- Frequency range: 20Hz-15kHz
- Tracking ability @ 315Hz @ recommended tracking force: 70 µm
- Compliance dynamic lateral: 15 µm/mN
- Stylus type: Spherical
- Stylus tip radius: R 65 µm (2.5 mil)
- Stylus tip mass: 0.5 mg
- Tracking force range: 1.8-2.5 g (18-25 mN)
- Tracking force recommended: 2 g (20 mN)
- Tracking angle: 20°
- Internal impedance DC resistance: 750 ohms
- Internal inductance: 450 mH
- Recommended load resistance: 47k ohms
- Recommended load capacitance: 200 - 600 pF
- Color: Black
- Weight: 5 g
- Stylus replacement: Ortofon Stylus 78
Notes on Mono Records & Cartridges Styli
Modern Microgroove Records have a V profile Groove & Modern Mono Microgroove Re-issues
0.7mil is Suitable for Reissue Monaural LP and a Mono LP of after 1960.
1.0mil is Suitable for the Monaural LP of a deep groove of the first press of the 1950s.
However, both styli can trace the monaural LP of all generations without a problem.
When you listen to the monaural LP of all generations, we recommend 0.7mil.
When you listen to a monaural LP of the first press of the 1950s mainly, we recommend 1.0mil.
3.0mil usually ideal for 78rpm mono records
Why Mono ?
A mono cartridge is mechanically different from a stereo cartridge. Simply switching a stereo cartridge to mono does not work perfectly. Despite what manufactures claim mono switches invariably add the two channels by simply shorting the two channels together, even very" expensive units do this. Hiend units can sum the two channels with extra electronics to eliminates the vertical response and improve the signal to noise by 3dB. However even summing does not provide the ultimate, a cartridge designed for mono, with a single coil and no vertical movement reduces surface noise, vertical noise and fits the groove properly.
Older Mono records have a U type Groove Mono/78RPM 3.0mil is the accepted norm & Steel Needles for gramophone records
other types used by collectors are 2.0/2.5/3.0/3.5/4.0/8.0 ( MIL = 1/1000th of a inch )
2.0MIL - 2.0 X 0.4 mil Elliptical diamond - worn LPs, some transcriptions.
2.5MIL - 2.5 X 0.5 mil elliptical diamond - late unworn 78s
3.0MIL - 3.0 X 0.5 mil elliptical diamond - most 1905 to 1940's, slightly worn 78s & transcriptions, & some Edison discs.
3.5MIL 3.5 X 0.8 mil elliptical diamond - old or worn 78s, transcriptions.
4.0MIL 4.0 X 1.0 mil elliptical diamond - Edison Diamond & very old/worn discs, raw aluminium, RCA home recordings., also Pathé vertical discs
8.0MIL 8.0 mil conical sapphire - RCA home recordings, and worn Pathé vertical discs.
