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Thread: SUT shielding

  1. #1
    Join Date: Dec 2015

    Location: Alicante. Spain.

    Posts: 1,885
    I'm Adrian.

    Default SUT shielding

    I'm looking at SUT's at the moment and am being tempted by the Dave Slagle custom wound transformers which he will make to precisely match a given cart (important I think).

    Having owned and been very very happy with his autoformers (maybe in private exhibitions once my 'the Truth' linestage finally arrives - 6 weeks in customs up to now?) I'm confident he knows what he's doing.

    But the price difference between naked and shielded transformers is huge. In copper, €470 without shielding, €2,200 with shielding - ouch!

    So, how and with what can the transformers be shielded?

    Adey

    Sent from my Aquaris E4.5 using Tapatalk
    Technics SP10 mk2
    Jan Allaerts MC 1 Boron mk1 cart
    Miyajima Shilabe cart
    Hashimoto HM-X SUT
    Siggwan (gimballed not unipivot) Cocobola 12"
    Aurorasound Vida LCR Phonostage
    The Truth linestage
    Dave Slagle Autoformer Volume Controller
    Cary 805c SET amps
    Audio Note ANe-SPX speakers
    Townshend Isolda speaker cables
    Cardas Golden Presence interconnects

  2. #2
    Join Date: Jan 2009

    Location: Essex

    Posts: 31,853
    I'm openingabottleofwine.

    Default

    I would have thought provided the SUTs have a low leakage inductance, any permeable (ferromagnetic) metal would do. Mumetal would be the best, but is has to be treated with care: sharp bends or holes drilled through it will damage the shielding properties.
    Barry

  3. #3
    Join Date: Dec 2015

    Location: Alicante. Spain.

    Posts: 1,885
    I'm Adrian.

    Default

    I know Dave uses a very unusual mix of shielding elements including copper, steel, mumetal and maple - but mumetal is available, as is steel and copper. His hand built units are always first rate, top class affairs but by heck at a price.
    Adey

    Sent from my Aquaris E4.5 using Tapatalk
    Technics SP10 mk2
    Jan Allaerts MC 1 Boron mk1 cart
    Miyajima Shilabe cart
    Hashimoto HM-X SUT
    Siggwan (gimballed not unipivot) Cocobola 12"
    Aurorasound Vida LCR Phonostage
    The Truth linestage
    Dave Slagle Autoformer Volume Controller
    Cary 805c SET amps
    Audio Note ANe-SPX speakers
    Townshend Isolda speaker cables
    Cardas Golden Presence interconnects

  4. #4
    Join Date: May 2016

    Location: Much Wenlock

    Posts: 1,522
    I'm Gary.

    Default

    It is relatively easy to make a Faraday cage, not using any exotic materials or layers. Aluminium mesh ( or any material that is electrically conductive) is cheap and effective.

    Google Faraday cage.

    You can even protect from EMP by direct connection to earth.

    Cannot understand why it should be so expensive?

  5. #5
    Join Date: Jan 2009

    Location: Essex

    Posts: 31,853
    I'm openingabottleofwine.

    Default

    A Faraday cage won't offer any shielding to magnetic fields.
    Barry

  6. #6
    Join Date: May 2016

    Location: Much Wenlock

    Posts: 1,522
    I'm Gary.

    Default

    Quote Originally Posted by Barry View Post
    A Faraday cage won't offer any shielding to magnetic fields.
    You're right, it needs to be solid material for magnetic shielding.

  7. #7
    Join Date: Dec 2015

    Location: Alicante. Spain.

    Posts: 1,885
    I'm Adrian.

    Default

    I know mumetal can be bought on fleabay, likewise steel and copper sheets - I guess the issue would be making sure there were no gaps and that RCA's were well fitted. Considering how fairly priced Dave's stuff usually is there must be something 'special' about the enclosures and internals...
    Adey

    Sent from my Aquaris E4.5 using Tapatalk
    Technics SP10 mk2
    Jan Allaerts MC 1 Boron mk1 cart
    Miyajima Shilabe cart
    Hashimoto HM-X SUT
    Siggwan (gimballed not unipivot) Cocobola 12"
    Aurorasound Vida LCR Phonostage
    The Truth linestage
    Dave Slagle Autoformer Volume Controller
    Cary 805c SET amps
    Audio Note ANe-SPX speakers
    Townshend Isolda speaker cables
    Cardas Golden Presence interconnects

  8. #8
    Join Date: Jan 2009

    Location: Essex

    Posts: 31,853
    I'm openingabottleofwine.

    Default

    Quote Originally Posted by Stryder5 View Post
    You're right, it needs to be solid material for magnetic shielding.
    It also needs to made of a magnetic material: iron, steel, nickel, mumetal etc.
    Barry

  9. #9
    Join Date: Sep 2013

    Location: North Island New Zealand

    Posts: 1,757
    I'm Chris.

    Default

    Would help to see the step up transformer type and differences being asked, an image or two ?

    Toroidal type transformers are amongst the best for very low fields, hence looking at their construction
    and why they offer advantage, may give some answers.

    Given the amount of scrap metal available, and as long it meets requirements of safety, fashioning
    a cover suggests the way to go.
    Last edited by Light Dependant Resistor; 03-01-2017 at 22:31.

  10. #10
    Join Date: Dec 2015

    Location: Alicante. Spain.

    Posts: 1,885
    I'm Adrian.

    Default

    The only pic I can find is if the transformers, the case is not a Slagle creation, it's a diy job.



    Sent from my Aquaris E4.5 using Tapatalk
    Technics SP10 mk2
    Jan Allaerts MC 1 Boron mk1 cart
    Miyajima Shilabe cart
    Hashimoto HM-X SUT
    Siggwan (gimballed not unipivot) Cocobola 12"
    Aurorasound Vida LCR Phonostage
    The Truth linestage
    Dave Slagle Autoformer Volume Controller
    Cary 805c SET amps
    Audio Note ANe-SPX speakers
    Townshend Isolda speaker cables
    Cardas Golden Presence interconnects

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