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Thread: mordaunt short ms700

  1. #11
    Join Date: Sep 2014

    Location: brighton uk.

    Posts: 4,737
    I'm jamie.

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    Wow, cheers for the info, the seller has gone quiet since the auction finished so it may not happen
    My System
    John Wood KT88 Amp.
    Paradise Phono Stage
    Sony TTS-8000 Turntable.
    PMAT-1010 MK6 Tonearm.
    Ortofon Cadenza Bronze
    Sony X555ES Cd Player
    Yamaha NS1000m Speakers

  2. #12
    Join Date: Jun 2015

    Location: London/Durham

    Posts: 6,869
    I'm Lawrence.

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    Quote Originally Posted by Pharos View Post
    In about '74, when I had Tannoy Gold 15" Lancs, my neighbour bought a pair of MS which had the London (gold painted) ribbon, and they were IMO better, cleaner smoother top.

    That unit is limited to about 25W I believe and the ribbon can easily be destroyed if over driven, but very good for the period.
    I think the larger London ribbon was always black, it was split down the middle by a bar, whereas the smaller, usually gold (silver/grey if made by Romagna reproducers rather than Decca) model was called the Decca Kelly IIRC.

    Sent from my POT-LX1 using Tapatalk

  3. #13
    Join Date: Sep 2014

    Location: brighton uk.

    Posts: 4,737
    I'm jamie.

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    big buggers! lol
    My System
    John Wood KT88 Amp.
    Paradise Phono Stage
    Sony TTS-8000 Turntable.
    PMAT-1010 MK6 Tonearm.
    Ortofon Cadenza Bronze
    Sony X555ES Cd Player
    Yamaha NS1000m Speakers

  4. #14
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 1,861
    I'm Dennis.

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    Those I remember, but I can't help but feel that the Kelly should be 90 degrees rotated for dispersion.

  5. #15
    Join Date: Sep 2014

    Location: brighton uk.

    Posts: 4,737
    I'm jamie.

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    just for shit and giggles,if i wanted to use the decca for a super tweeter what capacitor value in series should i try? anyone know?
    here's a behind the scenes shot




    My System
    John Wood KT88 Amp.
    Paradise Phono Stage
    Sony TTS-8000 Turntable.
    PMAT-1010 MK6 Tonearm.
    Ortofon Cadenza Bronze
    Sony X555ES Cd Player
    Yamaha NS1000m Speakers

  6. #16
    Join Date: Jun 2015

    Location: London/Durham

    Posts: 6,869
    I'm Lawrence.

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    Off hand I'm not sure about the value but it depends on whether you want to "add some air" or increase the treble noticeably. If the former, as it's a first order crossover you're talking about with a shallow roll off, you should aim quite high, at least 16khz I'd say if not even higher. The sensitivity of the Kelly ribbon relative to your speakers is also an important factor, as you won't want it contributing too strongly, but that would involve an L pad or something. Others more technical than me will know more

    Sent from my POT-LX1 using Tapatalk

  7. #17
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

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    With a small cap, say 0.1uF the output will be dropping off at 6db/oct below about 18kHz, with full output coming on above that. As that is so high any excess output will be beyond hearing so attenuation shouldn't be necessary.

    I have actually done this with the DK30 and know it works, just juggle cap values until the results sound right, 0.1uF being the smallest to try. It may pay to try it connected out of phase too.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  8. #18
    Join Date: Sep 2014

    Location: brighton uk.

    Posts: 4,737
    I'm jamie.

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    been busy today,i got rid of the old ms speaker connectors,they are just pan screw heads that you trap the wires in.ive cleaned and put on some from the ditton 66's.plus ive raided my spares box and actually found a load of new alcaps,enough to re do all the old electrolytic's in the crossovers!they have lost that boxy sound and now are much better intergrated.


    a bodge but effective!

    My System
    John Wood KT88 Amp.
    Paradise Phono Stage
    Sony TTS-8000 Turntable.
    PMAT-1010 MK6 Tonearm.
    Ortofon Cadenza Bronze
    Sony X555ES Cd Player
    Yamaha NS1000m Speakers

  9. #19
    Join Date: Aug 2009

    Location: Staffordshire, England

    Posts: 37,771
    I'm Martin.

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    Has it sorted out the poor midrange performance then?
    Current Lash Up:

    TEAC VRDS 701T > Sony TAE1000ESD > Krell KSA50S > JM Labs Focal Electra 926.

  10. #20
    Join Date: Sep 2014

    Location: brighton uk.

    Posts: 4,737
    I'm jamie.

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    better id say but that could be down to being better intergrated,im glad ive recapped them but the ns1000's are going back in place in a mo .
    My System
    John Wood KT88 Amp.
    Paradise Phono Stage
    Sony TTS-8000 Turntable.
    PMAT-1010 MK6 Tonearm.
    Ortofon Cadenza Bronze
    Sony X555ES Cd Player
    Yamaha NS1000m Speakers

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