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Thread: Magna Audio's custom-made counterweight balance and armboard service!

  1. #51
    Join Date: Dec 2008

    Location: Yorks

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    Quote Originally Posted by speedy.steve View Post
    What is the diameter? Clamping large flat things in my chuck might be problematic...
    Your right it would be a small nightmare to make..I've an idea would it be possible to make a Linn type mounting collar with a specified diameter bore?

    I don't want the scoupe in it as pictured but i do want side entry grub screw. I could try get one to work from! Only requires three tapings undeside for fixing to deck.


  2. #52
    Join Date: Mar 2009

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    Quote Originally Posted by Andre View Post
    Your right it would be a small nightmare to make..I've an idea would it be possible to make a Linn type mounting collar with a specified diameter bore?

    I don't want the scoupe in it as pictured but i do want side entry grub screw. I could try get one to work from! Only requires three tapings undeside for fixing to deck.

    Looks reasonable.
    Something to work from would be good to get the underside tappings in exactly the right place.
    System: Turntable : SP10 MKII slate plinth, Custom Ebony tonearm board, Arm : Fidelity Research FR64s, Cartridge : SPU Royal N. SUT : Lundahl 1:13. Phonostage : Icon Audio, Streaming RPi/Kali reclocker -> I2S -> DSP XO / Pre / 4 DAC's : WAF Najda, 5 Poweramps : 3 x EL84 SET's, 2 x D class amps on bass channels, Speakers : 5 way front loaded horn system: 2 X Tapped sub 15" LF drivers / 2 X Exponential mid bass 15" drivers / Tractrix 200Hz mid horns with JBL2482's, / Tractrix 550Hz upper wooden horns with factory refurb'd Vitavox S2's / Raal Lazy Ribbons as high frequency tweeters. Wires: good silver or good copper where best suited. DIY RCM.

    Maker of tonearm boards, armpods, Tannoy GRF style speaker cabinets, horn speakers, counterweights and more.
    For more information about my creations and products please click below

    http://fosworld.wixsite.com/magna-audio & on Instagram https://www.instagram.com/magna_audio/

  3. #53
    Join Date: Dec 2008

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    Quote Originally Posted by speedy.steve View Post
    Looks reasonable.
    Something to work from would be good to get the underside tappings in exactly the right place.
    Brill i'll see if i can locate one..

  4. #54
    Join Date: May 2008

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    The sad thing is that you couldn't give LVV arms away not that long ago, and the base plate was the same as the Ittok one. I don't know why, but the LVV now sells for more than the LVX quite often - £100 or so.. Madness IMO
    Tear down these walls; Cut the ties that held me
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  5. #55
    Join Date: Jan 2008

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    Herewith & attached a recent pic of my Techie 1210 with special heavy brass c/weight by speedysteve for my massive re-bodied Denon 103.

    I've had the c/w a while and it does an excellent job .... but the brass colour just increasingly irritated me! ... such a sharp contrast with everything else on the deck.

    So for a couple of £ on good ol' fleaBay I picked up a small jar of silver chrome paint .... ah, that's better!
    [Ackcherly - the silver paint job hasn't come out well with the camera flash - the actual beastie looks better than that].


    Last edited by jandl100; 23-06-2010 at 14:53.
    .

  6. #56
    Join Date: Mar 2009

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    Mr Coco being a clever sort of chap who needed a big CW for his Alphason / IO lump did some research as to metal densities and came up with Tungsten being good and dense. Bit hard to work Tungsten perhaps so a Tungsten / Copper alloy was found.

    According to the Coco metal density bible, densities are:-
    75% Tungsten 25% Copper – Density 14.75
    Tungsten Alloy – Density 16.9
    Tungsten 99.95% - Density 19.3
    Molybdenum 99.95% - Density 10.22
    Steel is 7.8ish and brass is 8.5ish. So the copper/tungsten is about twice as much.

    Here is a first weight made up for my arm (12" wand on PL-71 arm base & SPU Silver Meister cart).

    Here is the comparison with the lash up I was using before - moves the mass much further in!


    Slightly pink copper look that will dull as it slowly oxidises.

    Moving the mass in is apparently a good thing to do - reduces the inertia and looks better not having a lump hanging over the end...


    Last edited by Magna Audio; 31-10-2017 at 23:01.
    System: Turntable : SP10 MKII slate plinth, Custom Ebony tonearm board, Arm : Fidelity Research FR64s, Cartridge : SPU Royal N. SUT : Lundahl 1:13. Phonostage : Icon Audio, Streaming RPi/Kali reclocker -> I2S -> DSP XO / Pre / 4 DAC's : WAF Najda, 5 Poweramps : 3 x EL84 SET's, 2 x D class amps on bass channels, Speakers : 5 way front loaded horn system: 2 X Tapped sub 15" LF drivers / 2 X Exponential mid bass 15" drivers / Tractrix 200Hz mid horns with JBL2482's, / Tractrix 550Hz upper wooden horns with factory refurb'd Vitavox S2's / Raal Lazy Ribbons as high frequency tweeters. Wires: good silver or good copper where best suited. DIY RCM.

    Maker of tonearm boards, armpods, Tannoy GRF style speaker cabinets, horn speakers, counterweights and more.
    For more information about my creations and products please click below

    http://fosworld.wixsite.com/magna-audio & on Instagram https://www.instagram.com/magna_audio/

  7. #57
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    Looks great Steve. I'd forgotten you are doing these - I need to sort something for my SME 3009 S2 Improved now I am running a Sumiko headshell, currently lashed up with two 50p pieces and some white-tack - it should be a fairly straightforward job, just a cylindrical weight with a thread and then a threaded piece:

    Basically this is the standard one, and it needs to be heavier. Is that something you would be able to do? (And rough cost - PM if you like.) Cheers!
    Alex

    Main System: Digital: HP Laptop/M2Tech Hiface/Logitech Media Server/FLAC; Marantz SA7001 KI Signature SACD Player and other digital stuff into Gatorised Beresford Caiman DAC Vinyl: Garrard 401/SME 3009 SII Improved/Sumiko HS/Nagaoka MP-30
    Amplifier: Rega Brio R. Speakers: Spendor SP1. Cables: Various, mainly Mark Grant.
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  8. #58
    Join Date: Mar 2009

    Location: The New Forest

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    Here is a CW for Mr Coco. He wanted 240g which would be rather large in brass or SS.
    This is to balance his IO electromag cart...

    He found Tungsten - I said isn't that rather hard to work? So Tungsten copper alloy was the trick, being pretty heavy - just 10cm of it at 41mm dia weighed 2.4kg!

    Here is the new weight vs the Alphason ~ 100g one.

    Note the inner nylon sleeve which presumably acts as a dampening. The grub actually presses the nylon tube onto the
    CW arm stub.



    The slight salmon tinge is quite nice and fades away a bit with some weathering.


    Last edited by Magna Audio; 31-10-2017 at 23:01.
    System: Turntable : SP10 MKII slate plinth, Custom Ebony tonearm board, Arm : Fidelity Research FR64s, Cartridge : SPU Royal N. SUT : Lundahl 1:13. Phonostage : Icon Audio, Streaming RPi/Kali reclocker -> I2S -> DSP XO / Pre / 4 DAC's : WAF Najda, 5 Poweramps : 3 x EL84 SET's, 2 x D class amps on bass channels, Speakers : 5 way front loaded horn system: 2 X Tapped sub 15" LF drivers / 2 X Exponential mid bass 15" drivers / Tractrix 200Hz mid horns with JBL2482's, / Tractrix 550Hz upper wooden horns with factory refurb'd Vitavox S2's / Raal Lazy Ribbons as high frequency tweeters. Wires: good silver or good copper where best suited. DIY RCM.

    Maker of tonearm boards, armpods, Tannoy GRF style speaker cabinets, horn speakers, counterweights and more.
    For more information about my creations and products please click below

    http://fosworld.wixsite.com/magna-audio & on Instagram https://www.instagram.com/magna_audio/

  9. #59
    Join Date: Mar 2009

    Location: The New Forest

    Posts: 1,855
    I'm Steve.

    Default Brass CW for naimless

    Here is a brass CW for AOS member naimless.
    120g to replace the lost CW for his PL-71.
    Handy that I have a PL-71 to test it on.



    Last edited by Magna Audio; 31-10-2017 at 08:14.
    System: Turntable : SP10 MKII slate plinth, Custom Ebony tonearm board, Arm : Fidelity Research FR64s, Cartridge : SPU Royal N. SUT : Lundahl 1:13. Phonostage : Icon Audio, Streaming RPi/Kali reclocker -> I2S -> DSP XO / Pre / 4 DAC's : WAF Najda, 5 Poweramps : 3 x EL84 SET's, 2 x D class amps on bass channels, Speakers : 5 way front loaded horn system: 2 X Tapped sub 15" LF drivers / 2 X Exponential mid bass 15" drivers / Tractrix 200Hz mid horns with JBL2482's, / Tractrix 550Hz upper wooden horns with factory refurb'd Vitavox S2's / Raal Lazy Ribbons as high frequency tweeters. Wires: good silver or good copper where best suited. DIY RCM.

    Maker of tonearm boards, armpods, Tannoy GRF style speaker cabinets, horn speakers, counterweights and more.
    For more information about my creations and products please click below

    http://fosworld.wixsite.com/magna-audio & on Instagram https://www.instagram.com/magna_audio/

  10. #60
    Join Date: May 2008

    Location: A Strangely Isolated Place in Suffolk with Far Away Trains Passing By...

    Posts: 14,535
    I'm David.

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    Quote Originally Posted by Alex_UK View Post
    Looks great Steve. I'd forgotten you are doing these - I need to sort something for my SME 3009 S2 Improved now I am running a Sumiko headshell, currently lashed up with two 50p pieces and some white-tack - it should be a fairly straightforward job, just a cylindrical weight with a thread and then a threaded piece:

    Basically this is the standard one, and it needs to be heavier. Is that something you would be able to do? (And rough cost - PM if you like.) Cheers!
    Alex, I don't mean to stand on Mr Speedy's toes, but don't SME themselves do a heavier screw-in counterweight for the "improved" 3009S2? I'm sure Steve could make you up something special though as long as he knows the thread pitch needed.
    Tear down these walls; Cut the ties that held me
    Crying out at the top of my voice; Tell me now if you can hear me

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