@murrayjohnson will know, but I think the original Audio Note Japan (Kondo) Ios were very low output.
When Kondo stopped making them ANUK started manufacture but they were basically copies of the ANJ Io.
Guy wrote a fantastic post years ago on the WAM about the Io cartridge, it’s history and manufacture which has disappeared down some internet black hole or another as I just had a go searching for it and failed miserably
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