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Thread: B&W DM70; rebuilding an Icon

  1. #11
    Join Date: Jan 2014

    Location: Winkel - The Netherlands

    Posts: 34
    I'm Norman.

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    So it has been a while since my last update.

    The Power units are still being restored. I had some difficulties finding the schematics but thanks to a Dutch guy over at the http://www.vintage-radio.net/forum I got a copy.
    Next was finding the right (physical) 800 Ohm resistors; this is still a work in progress.

    The stands have now being made, all by hand and (almost) to original size / specs.
    They still need to get a layer of mat black paint.





    The cabinets have been freshly painted with RAL9010 and here are some images with the new stands.





    In two weeks I will drive up to Germany to have the Electrostatics renewed.
    Living; Linn Akurate Kontrol/0‏, Nuforce 9 v3se, Linn Majik DS, Cambridge CD CXC, Tannoy "Langley"
    Study; Marantz 4270, Marantz 140‏, Dual 1229Q, AR3a

  2. #12
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 320
    I'm Dennis.

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    If they are mild steel do use a Hammerite or similar for bonding and anti rust; that is a lot of work to sabotage.

  3. #13
    Join Date: Sep 2014

    Location: brighton uk.

    Posts: 2,535
    I'm jamie.

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    I like the picture of the lambretta, my guess is a model d
    My System/ Yamaha NS1000M speakers, Townsend Elite rock 2 turntable,,Alphason HR-100S-MCS tonearm,Decca C4E cartridge ,Sony 700ES Amp,Sony X555ES CD Player, Nakamichi ca5 pre amp ,

  4. #14
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 28,505
    I'm Geoff.

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    Quote Originally Posted by jamie123 View Post
    I like the picture of the lambretta, my guess is a model d
    Horrible things!
    Mr. Tact!

    Main system: MMs/ADCs/Low output MC's/One rare Japanese SUT/One scarce British phono stage/various tonearms/hefty Japanese DD TT and hefty Japanese BD TT and small British BD TT. 4 CD players/2 jitter buster/2 DACs/Valve buffer. TVC stepped attenuator or valve pre-amp or solid state pre-amp. Current dumping power-amp or either of two Class A SS power-amp or Class A EL34 valve monos or big Japanese (part Class A) integrated. Big dual concentric speakers/Smaller dual concentric speakers/Two way British compacts and full range speakers, amongst others. And too much more to list!

  5. #15
    Join Date: Oct 2012

    Location: NE England

    Posts: 4,647
    I'm Jez.

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    Quote Originally Posted by walpurgis View Post
    Horrible things!
    Yep. Land fill at best!

  6. #16
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 36,518
    I'm Grant.

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    Looking great Norman
    Regards,
    Grant ....

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    DENON DV2900 - TWIN PRO MONOBLOCK AMPLIFIERS - XIANG SHENG DAC\PRE\HEADPHONE AMP - AVANTREE OASIS CLASS 1 BLUETOOTH - AUDIO TECHNICA ATH-MSR7 & OPPO PM-3 PLANAR HEADPHONES - WIN10 JRIVER23, SPOTIFY PREMIUM - ECHO DOT - SMSL M6 MINIDAC - FULL RANGE TWIN TELEFUNKEN's - Q ACOUSTIC BT3 actives - CANTON SUB - MAINS REGENERATED AND FILTERED.

  7. #17
    Join Date: Jan 2009

    Location: Essex

    Posts: 16,073
    I'm openingabottleofwine.

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    I bet those electrostatic tweeters and moving-coil woofers are producing a nice, clear and transparent sound.
    Have you listened to this month's choice in the Album Club?

    Barry

  8. #18
    Join Date: Jan 2014

    Location: Winkel - The Netherlands

    Posts: 34
    I'm Norman.

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    Quote Originally Posted by Barry View Post
    I bet those electrostatic tweeters and moving-coil woofers are producing a nice, clear and transparent sound.
    Yep, very "open"
    Living; Linn Akurate Kontrol/0‏, Nuforce 9 v3se, Linn Majik DS, Cambridge CD CXC, Tannoy "Langley"
    Study; Marantz 4270, Marantz 140‏, Dual 1229Q, AR3a

  9. #19
    Join Date: Jan 2014

    Location: Winkel - The Netherlands

    Posts: 34
    I'm Norman.

    Default

    Quote Originally Posted by jamie123 View Post
    I like the picture of the lambretta, my guess is a model d
    Nope, it is a model B.

    I used to have a few Lambretta's. Love them!
    Living; Linn Akurate Kontrol/0‏, Nuforce 9 v3se, Linn Majik DS, Cambridge CD CXC, Tannoy "Langley"
    Study; Marantz 4270, Marantz 140‏, Dual 1229Q, AR3a

  10. #20
    Join Date: Jan 2014

    Location: Winkel - The Netherlands

    Posts: 34
    I'm Norman.

    Default

    Time for another update!

    Filters and High Power Units have been reworked to specs.

    HPU


    Filters


    We have also tested them with the spare Electrostats that I have.

    Little nervous to power them on after being without power for years.

    But they switched on without issues, tone generator generated a nice tone with no disturbing noises or deformation.





    It is a shame that the aluminum fronts of the Electrostats are damaged and that replacement is no where to be found.
    I've decided I will use plain aluminum on the Electrostats and woofer to have a overall look.
    They will be painted (muffled) in black and I think it will be perfect.



    The woofers from the donor pair are removed form their cabinets.
    The stuffing is completely deteriorated and cannot be used so I have to find some other.

    Both woofers measure 6.3 Ohm.
    The're different in model looking at the magnet, probably one has been replaced under warranty.


    Living; Linn Akurate Kontrol/0‏, Nuforce 9 v3se, Linn Majik DS, Cambridge CD CXC, Tannoy "Langley"
    Study; Marantz 4270, Marantz 140‏, Dual 1229Q, AR3a

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