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  • Sennie MD421 capsule ?

    From geoff@21:1/5 to All on Wed Jul 13 13:12:59 2022
    The not uncommon 'thin sound' scenario. No, it's not anything to do with
    the roll-off switch (checked by substitution). The voice-coil in contact
    with the pole-piece I suspect.

    Seems the old version capsule is no longer obtainable, and from what I
    gather the '-II' version is not physically compatible.

    Can anybody here confirm if this is correct, or should I be able to get
    the 'II' to fit (and work somewhere near spec) in a 'classic' body ?

    TIA

    geoff

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  • From geoff@21:1/5 to palli...@gmail.com on Wed Jul 13 16:57:52 2022
    On 13/07/2022 4:50 pm, palli...@gmail.com wrote:
    geoff wrote:
    ===========

    The not uncommon 'thin sound' scenario. No, it's not anything to do with
    the roll-off switch (checked by substitution). The voice-coil in contact
    with the pole-piece I suspect.


    ** All the times I have seen that problem it was due to magnetic particles depressing the VC into the gap.
    Tiny bits of nickel plate flung off drum parts & frames is one source.
    Tricky to remove but can be done with a small screwdriver tip.



    ...... Phil

    Thanks for the tip - will take a peek .

    geoff

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  • From pallison49@gmail.com@21:1/5 to geoff on Tue Jul 12 21:50:36 2022
    geoff wrote:
    ===========

    The not uncommon 'thin sound' scenario. No, it's not anything to do with
    the roll-off switch (checked by substitution). The voice-coil in contact
    with the pole-piece I suspect.


    ** All the times I have seen that problem it was due to magnetic particles depressing the VC into the gap.
    Tiny bits of nickel plate flung off drum parts & frames is one source.
    Tricky to remove but can be done with a small screwdriver tip.



    ...... Phil

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Scott Dorsey@21:1/5 to geoff@nospamgeoffwood.org on Wed Jul 13 19:57:21 2022
    geoff <geoff@nospamgeoffwood.org> wrote:
    The not uncommon 'thin sound' scenario. No, it's not anything to do with
    the roll-off switch (checked by substitution). The voice-coil in contact
    with the pole-piece I suspect.

    Seems the old version capsule is no longer obtainable, and from what I
    gather the '-II' version is not physically compatible.

    Can anybody here confirm if this is correct, or should I be able to get
    the 'II' to fit (and work somewhere near spec) in a 'classic' body ?

    You might be able to get it to fit, but then it will sound like a -II which really there's little point to.

    The element on the original 421 is designed to be repairable. The diaphragm and coil pop off, you put a new one on and center it with shims and go. The problem is that they haven't actually sold the repair parts any time in the past half-century.
    --scott
    --
    "C'est un Nagra. C'est suisse, et tres, tres precis."

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