• Take care with Shure 55SH-II replacement capsules

    From geoff@21:1/5 to All on Thu Jan 10 15:44:01 2019
    This relates to the capsule voice-coil wiring itself, not to the yellow/back/blue lead-out wires.

    When replacing a dead cartridge I found the replacement to also be
    open-circuit once fitted. On inspection it became clear that the yellow
    tape covering and supposedly supporting the hair-thin voice-coil wire to
    one terminal was not stuck down firmly the the pcb end-cap. This meant
    that the slightest pressure on the tape fractured the wire off the
    solder lug.

    Fortunately I was able to recover enough wire to re-terminate it. I subsequently supported the tape/wire/lug area with hot-melt glue.

    On checking another virgin capsule ex-factory, this was also not well
    stuck down, and essentially floating free. This would make the wire
    vulnerable to physical shock.

    If anybody else doing a cartridge replacement on one of these I suggest
    that the FIRST thing to do is to do the glue thing. And also to use
    minimal iron temperature to solder, as the voice-coil wire itself can be inadvertently melted.

    Good luck !

    geoff

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