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Thread: Wanted: cheap DC blocker

  1. #11
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 4,921
    I'm Oliver.

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    Quote Originally Posted by walpurgis View Post
    Not my work Oliver. I bought a completed board, as it's not that much dearer than a self assembly item.

    Whole thing will stand me in a little over fifty quid. Ther Sjostrom board is very nice quality.
    That's a great price! Mine was a bit more than that.

    Sent from my EVA-L09 using Tapatalk
    Technics SP10 MK2 > Phonomac AT-1010 tonearm > Ortofon Kontrapunkt b > Wizard Jfet MC Valve Phonostage (Telefunken Valves) > Slagle AVC Passive Preamp > Firebottle Monoblocks (Telefunken Valves) > Fisual S-Flex Speaker Cable > Pioneer CS-77A Speakers > SPOTFIRE Cables Throughout

  2. #12
    Join Date: Aug 2010

    Location: Stroud, Gloucestershire , UK

    Posts: 457
    I'm Jake.

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    A question on this whilst it’s on topic chaps. I’m playing with a new power amp that apparently passes dc through to the pre. Interested to know if it’s causihg some noise, so was looking at dc blocking rca devices to put between pre and power. Are they any good? Or is the sense more that you’re better blocking the dc at source ie the mains ?
    Technics SL-10/various carts - Tube Technology MAC - Modded Sonos/Jolida Glass FX3 - Nelson Pass B1 or Eastern Electric minimax - Jsoundlabs 300b - Ian's Frugal horn XL

  3. #13
    Join Date: Feb 2010

    Location: Maidenhead, Berks

    Posts: 82
    I'm Lee.

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    Quote Originally Posted by lordmortlock View Post
    A question on this whilst it’s on topic chaps. I’m playing with a new power amp that apparently passes dc through to the pre. Interested to know if it’s causihg some noise, so was looking at dc blocking rca devices to put between pre and power. Are they any good? Or is the sense more that you’re better blocking the dc at source ie the mains ?
    These DC Blockers are for the mains, not for low level signals. Jake, do you mean the pre is direct coupled? if so then any dc would be amplified by the power amp and eventually fry your tweeters if your are lucky of both units if not. I'm never trust direct coupled unless via a transformer, so have always had a decoupling cap in there somewhere prior to the power amp
    Cheers Lee

  4. #14
    Join Date: Aug 2010

    Location: Stroud, Gloucestershire , UK

    Posts: 457
    I'm Jake.

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    Ah ok, thanks Lee, that’s helpful. The comment re the power amp suggested avoiding pres that could pass dc on, so I guess they meant direct coupled units.

    The pre is an eastern electric minimax pre or a nelson pass b1 buffer clone. I’ll read up on these, try to understand what the designs do.
    Technics SL-10/various carts - Tube Technology MAC - Modded Sonos/Jolida Glass FX3 - Nelson Pass B1 or Eastern Electric minimax - Jsoundlabs 300b - Ian's Frugal horn XL

  5. #15
    Join Date: Apr 2015

    Location: Central Virginia

    Posts: 894
    I'm Russell.

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    Quote Originally Posted by montesquieu View Post
    Er, it's a mains issue. Plenty of info why needed in the links above or here
    Thank you sir, I have been schooled!


    Sent from my iPad using Tapatalk

  6. #16
    Join Date: Feb 2010

    Location: Maidenhead, Berks

    Posts: 82
    I'm Lee.

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    Jack, just to clarify, if your power amp has a cap blocking DC you would be ok. I see you have a 300b amp so I know that they have coupling caps between the 6sn7 and 300b so no worries, even with a direct coupled pre.
    Cheers Lee

  7. #17
    Join Date: Aug 2010

    Location: Northampton, UK

    Posts: 66
    I'm Dennis.

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    I am using two ATL units: https://www.atlhifi.com/shop/fully-a...mbled-in-case/
    Excellent VFM and fast delivery

    They work very well with my V20 and WA22
    Last edited by dennis; 15-01-2018 at 19:56. Reason: update
    Brix i7 - Roon Core - HQ Player, ISO Regen, Lps-1, Win10 NAA, Lampizator L4G5 balanced + DSD512 Dac, EAR V20, Woo Audio WA22, PMC Twenty5 23, Van den Hul M.C. CS122 Hybrid speaker cable, Belden / Mark Grant mains & interconnects , Audeeze LCD-XC, Senn HD800, IsoL8 Minisub2

  8. #18
    Join Date: Nov 2013

    Location: Belgium

    Posts: 151
    I'm Chris.

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    Hi Tom,
    This one works great as well:
    http://www.lcaudio.com/index.php?page=316

  9. #19
    Join Date: Sep 2015

    Location: Northants

    Posts: 14
    I'm John.

    Default DC Blocker

    Thanks for this thread, the result of which was that I bought the ATL unit which arrived yesterday.
    Would have done it years ago if only I had known - background silence - bliss.

    JDA99

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