If you are thinking of getting your stylus reconditioned then it would be well worth your time to read this outline of stylus specifications to help you make the right choice...
Below are options using different parts, the cheapest rebuild option is usually £199, higher specs offer better audio quality and in some cases, a longer useful life which is why the £390 option is the cheapest per hour also they are compared to original specifications for reference.
If the original diamond is in good condition (checked under microscope) suspension only repairs are possible £160
For all other repairs full rebuild is available as follows
This is a spherical diamond that has some of the front and back ground off, this allows the diamond to more accurately reproduce high frequencies The upgrade to elliptical from spherical is quite evident in sound quality in the vast majority of systems.
Closest to original B&O cartridge spec: SP12 MMC4000 SP15 MMC20EN MMC3
Slight upgrade from: MMC5 MMC4 MMC10E MMC20E
Significant Upgrade from: SP14 SP10 MMC20S MMC3000
This extended contact design allows the diamond to more accurately reproduce high frequency’s, in comparison to the elliptical design, it has more contact area which reduces record wear significantly and is able to track with slightly less force. This represents a further upgrade in sound quality over the Elliptical, in addition it lasts longer.
Closest to original B&O cartridge spec: MMC5000
Significant Upgrade from: SP12 MMC3 MMC20EN MMC4000
Micro Ridge is an advancement of the line contact design, in audio quality and useful life due to a small carefully shaped ridge which wears equally keeping the same shape as new for a much longer time than other basic extended contact styli so they continue to perform well and not damage records for approximately twice as long as other extended contact styli, offered paired with a Boron cantilever which is better than sapphire for audio quality due to being harder, It measures 9.5 Mohs with diamond at 10 Mohs and sapphire at 9 Mohs. This increase in strength gives better audio quality as the movement is more accurately transferred to the generator also since it is harder than sapphire it is also much less likely to break in the event of an accident. This specification surpasses all original Bang and Olufsen designs, in audio fidelity and useful life.
Upgrade from B&O cartridge spec: Every cartridge that will work on any B&O product
The option for anyone who wants to get the best possible audio quality the same as above with the improvement of having a diamond cantilever this is harder than boron which gives an increase in audio quality, this is a particularly rare part due to the high expense of manufacturing a solid diamond cantilever, it has the advantage of transferring the movement from the stylus to the generator more accurately than any other cantilever type available.
Useful life: 4000 hours under ideal conditions
Please note you are not required to do these tests as each cartridge will be tested on arrival and you will be informed if your cartridge has a fault. However if you want to test them yourself, then here is how to do it;
Every stereo phono cartridge has two coils one for each channel. The best way to test that these coils are functioning as intended is to use an ohmmeter to test the resistance. Each coil should measure about the same as the other. If both are the same or similar resistance then the coils are fine.
For B&O styli and cartridges this method can be applied for the MMC1-5 cartridge, the resistance should be approximately 700-800 ohms for this series. The two opposing pins are one coil and the other two opposing pins are the other coil. If both coils measure about the same resistance then it's fine.
For other cartridges, the resistance varies but this method can be applied to any stereo phono cartridge. Or if you are able to play a record and audio comes from both channels as long as your system is all working correctly and mono is not engaged then both coils are fine.
For the MMC20xx and MMCx000, these are difficult to test as the contacts are hard to get to. The easiest method is to use one of the ¼ inch adapters to make the contacts easier to test. If you do not have one of these then you can use thin probes to test inside. For this series, the two furthest to the right are one coil, and the two furthest to the left are the other coil. The resistance should be approximately 700-800 ohms for each coil.