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SP Cartridges pressure.

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matador43
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matador43 posted on Mon, Jun 24 2019 10:23 AM

Hi guys,

I have a couple of questions about SP cartridges, I haven't found the answer anywhere else:

My Beogram 3000 came with an SP10 cartridge. It's old and tired and presumably also broken as when the record come near the end the cantilever collapse and the head scrub the record.
But as long as it can stand up, it sounds: Basses are deep and sounds is very clear.
Middle medium could sometimes be a little muddy and high mediums also sometimes a little distorted though.
After close inspection, it seems that the diamond has vanished (what a surprise!) leaving just what seems to be a little metallic spike.
I have bought a second cartridge (SP12) for a good price. To my ears, it sound with the very same defects; It just don't collapse and stay as it should all along the record.

So my questions are:

- I'm right to think that the metallic spike is where the diamond was once built around or is there no spike at all and what I see are remains of the old diamond? Anyway what makes the cartridge still sound "acceptably"? I mean, if there's actually a metallic point, is it enough to make the record sound?

- For the stylus that collapse, can it be broken and still sound, or it is not broken but the pressure is too wrongly adjusted because if it where broke I will not ear any sound at all?

- Which leads me to the last topic. If I set the pressure as recommended (1 - 1.2) the stylus seems to be very crushed in both case even leading to the head touching the record in the case of the SP10. My guess is that I should apply as little pressure as possible even if below recommendations (Right now I'm at 0,5 and it lowers distortion a little bit and seems to work OK). I know people around here use normal settings and it works for them. But for me it never did (was it on the BG3000 or BG 1203).

Thanks to anyone with an insight about this.

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matador43
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Anybody?

DMacri
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DMacri replied on Wed, Jun 26 2019 11:04 AM
I’m not sure if the spike is metal or not, but if this is a bonded diamond tip, it is some kind of glue. It will still work if it could track the grooves, but obviously not optimally. Now for the tracking weight, I would make certain your starting point is correct. Maybe that’s throwing off your settings?

Dom

2x BeoSystem 3, BeoSystem 5000, BeoSystem 6500, 2x BeoMaster 7000, 2 pair of BeoLab Penta mk2, AV 7000, Beolab 4000, BeoSound 4000, Playmaker, BeoLab 2500, S-45, S-45.2, RL-140, CX-50, C-75, 3x CX-100, 3x MCL2 link rooms, 3x Beolab 2000, M3, P2, Earset, A8 earphones, A3, 2x 4001 relay, H3, H3 ANC, H6, 2014 Audi S5 with B&O sound, and ambio 

matador43
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Warm thank you to you for replying!

The "tip" I see with a microscope is silver but i can't say if it's actually metallic or some sort of diamond remains. I also dont expect the diamond to be in a god shape as both cells are presumed to be kept "as it" with not much care of them beyond safe storage.

Whats clever is in your words because "it could track the grooves, but obviously not optimally" may perfectly reflect the situation.

As for the adjustment of the arme of the arm, I followed the user manual and service manual procedure: adjusting counterweight until the arm floats like 1mm from its base, and then applying the pressure setting.

But where i can see you point is: I suspect "pressure" and "balance" is the same setting but like "fine" and "bold". If this makes sense it could be that my "bold" adjustment is off, despite all the care i put in it, therefore misleading the "fine" adjustment.

But because there is no obvious warning about that in both guides or in the web in general, I also question myself about a maybe mechanical wear in the mechanics making the adjustments?

Thanks again, I started to felt cursed Big Smile

 

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