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Thread: LDR preamp build

  1. #21
    Join Date: May 2008

    Location: A Strangely Isolated Place in Suffolk with far away trains passing by...

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    I'm David.

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    Interesting to see how one of these compares to a UK-Legal Khozmo 'pot-in-a-box' of similar resistance value. Both are passive types I understand.
    Tear down these walls; Cut the ties that held me
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  2. #22
    Join Date: Jan 2008

    Location: Wrexham, North Wales, UK

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    I'm AudioAl'sArbiterForPISHANTO.

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    Quote Originally Posted by Edwardlon View Post
    A little bird informs me an LDR pre has landed and awaiting test and feedback here.

    Hello Marco.
    Yes, but unfortunately life is getting in the way!

    Hopefully, I'll get some time during the week to fire her up.

    Marco.
    Proud anti-establishment/elite 'heretic', motivated to expose widespread Establishment bias, cover-ups and mind-control!

  3. #23
    Join Date: May 2008

    Location: Surrey

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    I'm Rob.

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    I built one years ago and it is the best pre I have....IMO of course. Not using a Pre now....and that is even better.
    Buy Bose...And get your parking validated!.

    https://youtu.be/ZCBe7-6rw4M

  4. #24
    Join Date: Mar 2017

    Location: London N2

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    I'm Edward.

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    Quote Originally Posted by Puffin View Post
    I built one years ago and it is the best pre I have....IMO of course. Not using a Pre now....and that is even better.
    I have an LDR pre but with 8 year old boards. Am waiting for the new boards which the maker Chris says is is even better. The current one is very good. Detailed, transparent, uncolored and just lets the music flow.

    How are you attenuating things?

    Main: Tidal/Roon > MiniITX > Metrum Hex > LDR > either Radford STA25 V or Trilogy 968 > Tannoy (Eaton or Berkeley).
    2nd: Tidal/Roon > Roopio on Pi > Chevron Paradox > Firebottle Buffer > Sugden Masterclass IA-4 > Kudos Cardea


  5. #25
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,802
    I'm Oliver.

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    Quote Originally Posted by DSJR View Post
    Interesting to see how one of these compares to a UK-Legal Khozmo 'pot-in-a-box' of similar resistance value. Both are passive types I understand.
    What do you mean by "UK-Legal Khozmo" Dave?
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > Bigbottle Jfet MC Valve Phonostage
    Digital: Orchard Audio PecanPi with JRiver
    Preamplifier: DCB1 with Khozmo 48 Step Series Attenuator or Neurochrome Differential Preamp
    Amplification: Neurochrome Modulus 686
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable
    Speakers: Mordaunt Short Performance 880

    Price List For SPOTFIRE Cables here:https://bit.ly/2Uxiv3j

    Alternative reading: http://www.audioaddictsforum.com

  6. #26
    Join Date: Jan 2009

    Location: Essex

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    I'm openingabottleofwine.

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    Quote Originally Posted by Bigman80 View Post
    What do you mean by "UK-Legal Khozmo" Dave?
    Suspect it's a subtle reference to the legal RoHS status (in the EU, and hence the UK) of devices using cadmium sulphide.
    Barry

  7. #27
    Join Date: Feb 2013

    Location: W Lothian

    Posts: 59,409
    I'm Grant.

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    Think it depends on the PPM as stated below. Looks like its permitted to have less than 100ppm...

    .....

    RoHS Restricted Substances

    RoHS specifies maximum levels for the following 10 restricted materials. The first six applied to the original RoHS while the last four were added under RoHS 3.

    Lead (Pb): < 1000 ppm
    Lead is commonly used in the electrical and electronics industry in solder, lead-acid batteries, electronic components, cable sheathing and in the glass of cathode-ray tubes.

    Mercury (Hg): < 100 ppm
    Mercury is widely used metals in the production of electrical and electronic appliances and is concentrated in batteries, switches and thermostats, and fluorescent lamps.

    Cadmium (Cd): < 100 ppm
    Cadmium is used in electronic equipment, car batteries, and pigments.

    Hexavalent Chromium (Cr VI) < 1000 ppm
    While some forms of chromium are non-toxic, Chromium VI can produce toxic effects.

    Polybrominated Biphenyls (PBB): 1000 ppm
    These are flame retardants found in electronic and electrical appliances. They have been found in indoor dust and air through evaporation from plastics.

    Polybrominated Diphenyl Ethers (PBDE): < 1000 ppm
    These are also flame retardants found in electronic and electrical appliances. Combustion of printed wiring boards release toxic emissions.

    Bis(2-Ethylhexyl) phthalate (DEHP): < 1000 ppm
    These are used to soften PVC and vinyl insulation on electrical wires.

    Benzyl butyl phthalate (BBP): < 1000 ppm
    These are used to soften PVC and vinyl insulation on electrical wires.

    Dibutyl phthalate (DBP): < 1000 ppm
    These are used to soften PVC and vinyl insulation on electrical wires.

    Diisobutyl phthalate (DIBP): < 1000 ppm
    These are used to soften PVC and vinyl insulation on electrical wires.
    Regards,
    Grant .... ؠ

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  8. #28
    Join Date: May 2008

    Location: Surrey

    Posts: 6,287
    I'm Rob.

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    Quote Originally Posted by Edwardlon View Post
    I have an LDR pre but with 8 year old boards. Am waiting for the new boards which the maker Chris says is is even better. The current one is very good. Detailed, transparent, uncolored and just lets the music flow.

    How are you attenuating things?

    I built mine P2P with a schematic posted on Diyaudio. I always thought that the LDR's would have a finite life, but many years on they are still going. The 100k pot is (I have always understood, but someone might correct me) a voltage control. The design as many others has variable resistors to give some control over channel imbalance given the nature of LDR's. However I use 2 additional pots that give much greater control over balance and work to very good effect.
    Buy Bose...And get your parking validated!.

    https://youtu.be/ZCBe7-6rw4M

  9. #29
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,802
    I'm Oliver.

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    I don't think I am too worries about it. Legal or not, it sounds superb.
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > Bigbottle Jfet MC Valve Phonostage
    Digital: Orchard Audio PecanPi with JRiver
    Preamplifier: DCB1 with Khozmo 48 Step Series Attenuator or Neurochrome Differential Preamp
    Amplification: Neurochrome Modulus 686
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable
    Speakers: Mordaunt Short Performance 880

    Price List For SPOTFIRE Cables here:https://bit.ly/2Uxiv3j

    Alternative reading: http://www.audioaddictsforum.com

  10. #30
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 9,802
    I'm Oliver.

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    Looks like a really tidy build. Looking forward to reading the feedback.

    Can it oust Marcos Croft pre?
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > Bigbottle Jfet MC Valve Phonostage
    Digital: Orchard Audio PecanPi with JRiver
    Preamplifier: DCB1 with Khozmo 48 Step Series Attenuator or Neurochrome Differential Preamp
    Amplification: Neurochrome Modulus 686
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable
    Speakers: Mordaunt Short Performance 880

    Price List For SPOTFIRE Cables here:https://bit.ly/2Uxiv3j

    Alternative reading: http://www.audioaddictsforum.com

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