Nagaoka NMP-2.5 78 RPM Mono Stylus 2.5 mil

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The Nagaoka 2.5 mil stylus is designed for mono LP's and 45 record playing.

Spherical Bonded Diamond Stylus

78RPM & MONO Microgroove 1.0mil , 2.0mil , 2.5mil 3.0mil , 3.5mil & 4.0mil

The stylus is used in the following Nagaoka phono cartridges: MP Series

MP-10 MP10, MP-11 MP11, MP-15 MP15, MP-20 MP20, MP-30 MP30, MP-50 MP50, MP-100 MP100, MP-110 MP110, MP-150 MP150, MP-200 MP200, MP-300 MP300, and MP-500 MP500.

To maintain the playback fidelity of your mono record you really need to use a stylus designed for mono records.
The 2.0 mil mono stylus is the standard for mono records. A very common misconception is that you can use a LP stylus for playing mono records and obtain remarkable results.
You cannot because the LP stylus is narrower than the 1.0 mil mono record groove, hence the tip will slide to the bottom of the groove where debris has collected for many decades.
A LP stylus will also slide side to side and will not trace the grooves properly. The use of a LP stylus will thus result in poor sound quality and extraordinarily high surface noise.

The generally accepted tip radius for playback of 78 RPM records is 3.0 Mil (0,003 inch).
Due to the playback in the past of these very old records with very high stylus pressure or even
with steel needles a lot of damage has been caused to the grooves. This damage is
the cause of a lot of distortion and back-ground noise. Sometimes better results can
be achieved by playing the record either on a lower part or a higher part of the groove
which may have been damaged less than the average height. To play-back at a higher
level, use either the 3.5 mil, 4.0 mil. To playback at a lower groove level use either
the 2.0 mil, or 2.5 mil tip. When you have found the best height affix a sticker to the
record so you will know the next time which stylus tip to use for best results.

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