MMC4000 and 6000 Lost Channels

2 replies
MI
Millicurie999
Bronze
22 posts
Posted April 10, 2026 at 00:46 GMT
#690889
Hi all, I have a MMC4000 and a MMC6000 cartridge. The 4000 has no sound at all, while the 6000 only has the right channel working. I am pretty sure it is the cartridges because the MMC20s works fine with my Beogram 4004. So my big question is can they be repaired? I know there are re-tipping services and also do tune-up, but one site says if the channels are out, then the cartridge is gone. The stylus for both the 4000 and 6000 look very clean and intact. It would be a shame if they are beyond repair. Thoughts and guidance please. 🙏  

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Beogram-400x.png Beogram-400x.png
Mark-sf
Mark-sf
Bronze
592 posts
Posted April 10, 2026 at 01:35 GMT
#718303
These cartridges are 50 years old and there is little doubt that the suspensions are shot even if the diamonds are fine. These diamonds, especially the 6000 are so small that unless you have a stereo microscope, you would not get an accurate picture on wear. You can confirm that the channel(s) is out due to they coils in the cartridge my measuring the hot and gnd of each channel at the cable with the arm cued down. If it measures significantly higher than 1000 ohms the cartridge is not salvageable.
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