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Thread: B&W DM70; rebuilding an Icon

  1. #11
    Join Date: Jan 2014

    Location: Winkel - The Netherlands

    Posts: 32
    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: 276
    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: 2,308
    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,Pioneer PLC-1700, direct drive turntable, Townsend Elite rock 2 turntable,,Alphason HR-100S-MCS tonearm,Ortofon 2M BLACK cartridge ,Sony 700ES Amp,Sony X555ES CD Player, Nakamichi ca5 pre amp ,

  4. #14
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 26,936
    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: 4,385
    I'm Jez.

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    Quote Originally Posted by walpurgis View Post
    Horrible things!
    Yep. Land fill at best!
    Arkless Electronics-Engineered to be better. Tel. 01670 530674 (after 1pm)

    Modded Thorens TD150, Audio Technica AT-1005 MkII, Technics EPC-300MC, Arkless Hybrid MC phono stage, Arkless passive pre, Arkless 50WPC Class A SS power amp, (or) Arkless modded Leak Stereo 20, Modded Kef Reference 105/3's
    ReVox PR99, Studer B62, Ferrograph Series 7, Tandberg TCD440, Hitachi FT-5500MkI, also FT-5500MkII
    Digital: Yamaha CDR-HD1500 (Digital Swiss army knife-CD recorder, player, hard drive, DAC and ADC in one), PC files via 24/96 sound card and SPDIF, modded Philips CD850, modded Philips CD104, modded DPA Little Bit DAC. Sennheiser HD580 cans with Arkless Headphone amp.
    Cables- free interconnects that come with CD players, mains leads from B&Q, dead kettles etc, extension leads from Tesco

  6. #16
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 34,581
    I'm Grant.

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    Looking great Norman
    Regards,
    Grant ....
    Sometimes incompetence is useful. It helps you keep an open mind.
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    IMUTO TAURUS X4 BATTERY SUPPLY. - RPI2B & AUDIOPHONICS DAC running MOODE 3.7- TONBRUX BATTERY SUPPLY & CHROMECAST2 AUDIO DONGLE no1 - JBE SERIES 3 SLATEDECK & EMOTIVA XPS-1 PHONO - DENON DV2900 - TWIN PRO MONOBLOCK AMPLIFIERS. - XIANG SHENG DAC\PRE\HEADPHONE AMP. -AUDIO TECHNICA ATH-MSR7 & OPPO PM-3 PLANAR HEADPHONES - WIN10 JRIVER22, SPOTIFY PREMIUM- KINPS CABLES, SMSL M6 MINIDAC, CHROMECAST2 AUDIO DONGLE no2 POWERED BY ANKER BATTERY PSU - FULL RANGE TWIN & SINGLE TELEFUNKEN's - Q ACOUSTIC BT3 actives - CANTON SUB - TANDBERG TCD310 CASS - CARTS.. ACD xlm mk1 integra, AT95SA Shibata, SHURE N55 SAS, SHURE M55E original, JVC MD1029. - RCA CABLES BY BRIAN SPKR CABLES BY MOI HAIR BY MARCO FEET BY ELECTRICBEACH - MAINS REGENERATED BY POWERINSPIRED AND FILTERED BY BELKIN PUREAV.

  7. #17
    Join Date: Jan 2009

    Location: Essex

    Posts: 15,680
    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: 32
    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: 32
    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: 32
    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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