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 Post subject: How many 78s does a sapphire last?
PostPosted: Oct Wed 18, 2017 4:08 am 
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Joined: Jun Sat 18, 2016 3:21 am
Posts: 14
Ok, so I keep hearing in terms of hours how long a Sapphire needle lasts. In most modern guides here on the internet, I'm assuming when they say 100 hours, they are talking about playing time in LP's because 100 hours of 78s seems like too long for a Sapphire to last.
My Cartridge tracks at 10grams (I have a 1955 VM 1285 Tube Tri-O-Matic). So I doubt that my 78rpm needle is going to last 100 hours.
So how about in terms of Record Sides. How many 78 Record Sides does a Sapphire play until it needs replacing? 50? 100?
What do you think?


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 Post subject: Re: How many 78s does a sapphire last?
PostPosted: Oct Wed 18, 2017 3:56 pm 
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Joined: Jan Wed 16, 2013 12:04 am
Posts: 1078
Location: 77001
What is the phono cartridge in the V-M changer ?

V-M 1285 should have a 1200 changer.
Ten grams seems too heavy a tracking force.

Condition and cleanliness of the 78's will determine the
wear, also.
Assume you are playing "modern" 78's, not early ones.

Your ear will tell you when the stylus is worn.
As you implied, there is no specific # of hours of
playtime for sapphire styli.

Hotwax


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 Post subject: Re: How many 78s does a sapphire last?
PostPosted: Oct Wed 18, 2017 4:48 pm 
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Joined: Jun Sat 18, 2016 3:21 am
Posts: 14
My cartridge is a rotating EV-88 (which take the Ronette type styli that clip in). It does indeed track at 10g which is normal for that cartridge, and before that I had an Astatic 64-TS which came with the player, another Rotating type which tracked at 8g (though I had it set waaaaay too light and therefor thought the distortion was due to a faulty cartridge).
I didn't even need to replace the Astatic but I did only because at the time, I thought it was dead. So after purchasing a scale I wanted to make sure the new cartridge was set at the correct tracking force. Once I adjusted it to 10g the cartridge sounded fine and no distortion etc. Here is a photo below:


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 Post subject: Re: How many 78s does a sapphire last?
PostPosted: Oct Wed 18, 2017 6:21 pm 
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Joined: Jan Wed 16, 2013 12:04 am
Posts: 1078
Location: 77001
I thought that 10 g was heavy, unless there was
a crystal cart in there. Since the track force is correct,
only the record condition should affect stylus wear.
Hotwax


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 Post subject: Re: How many 78s does a sapphire last?
PostPosted: Nov Tue 07, 2017 3:19 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 4127
Location: Berkley, Michigan
The 3-mil tip radius on a 78-rpm record wears slower than a 0.7-mil Lp tip. Being over three times larger, record contact is much greater so the force per square inch being exerted on the record is much less.

_________________
That warm tube sound can usually be overcome by turning up the treble.


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 Post subject: Re: How many 78s does a sapphire last?
PostPosted: Dec Mon 04, 2017 3:27 pm 
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Joined: Oct Mon 05, 2015 10:04 pm
Posts: 443
Location: Worcester Massachusetts
Some cartridges were specked at a higher tracking weight. The Internet myths about heavy tracking forces destroying records are just that, myths. 78's in their day were tracked very heavily, and still play fine. And if you try taking a cartridge that was designed to track heavy, you might not be happy with the results.

Track at the recommended weight, enjoy your records, and move beyond this Internet tracking weight obsession.

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TransOceanic A600, Royal 1000, 3000-1, Hallicrafters SX-42, S-38, S-40, Icom R-71A, Kenwood R-2000


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