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Thread: Passive Pre Amp Build.

  1. #1
    Join Date: Jul 2017

    Location: Kent

    Posts: 448
    I'm Paul.

    Default Passive Pre Amp Build.

    I've been through a few pre amps lately and the one I've enjoyed the most out of them was the tizzy ('was' meaning I foolishly sold it for some reason)

    So before I make another pre amp mistake I'm going to to build a little passive Pre with a dale stepped attenuator.

    I'm having no switch so just the one input but i want two outputs.

    The case arrived from aliexpress today and it fits together perfectly. Was described as aluminium but the weight of it suggests otherwise. Either way it's a solid box now it's together and it should barely move during operations so that's a good thing in my eyes.

    I was going to solder the rcas directly onto the Attenuator hence the cable glands inone of the pics but thinking about it, it's probably best to add rca sockets just in case I don't want to stick with it.

    Can anyone recommend some decent quality UK based female rca sockets? Are gold plated ones best? And what about a good internal wire? I could use some left over sommer carbokab but not sure this is necessary inside the case.

    Sent from my CLT-L09 using Tapatalk
    Current system:
    RPi + Allo Digione
    Beresford Caiman Seg & Dorado powered by 15v Linear PSU
    Transcendent Sound Mini Beast OTL
    Amptastic Mini-1
    Klipsch KG4.5 Speakers with Titanium Diagphrams and Sonicap Cap upgrade
    110aH Leisure Battery powers the Mini-1 & Digione

  2. #2
    Join Date: Dec 2014

    Location: UK, East Midlands

    Posts: 1,539
    I'm Mike.

    Default

    Built a few passives and usually use these as preferred:

    https://cpc.farnell.com/rean/nys367-...=rca%20sockets

    cpc are quick to deliver and prices are good - they do add a handling charge (not much) so best to order all you need at once.
    They take Paypal and have 'guest' checkout,

  3. #3
    Join Date: Jul 2017

    Location: Kent

    Posts: 448
    I'm Paul.

    Default

    Thanks Mike ill check them out.

    Sent from my CLT-L09 using Tapatalk
    Current system:
    RPi + Allo Digione
    Beresford Caiman Seg & Dorado powered by 15v Linear PSU
    Transcendent Sound Mini Beast OTL
    Amptastic Mini-1
    Klipsch KG4.5 Speakers with Titanium Diagphrams and Sonicap Cap upgrade
    110aH Leisure Battery powers the Mini-1 & Digione

  4. #4
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 10,019
    I'm Oliver.

    Default

    Quote Originally Posted by mikmas View Post
    Built a few passives and usually use these as preferred:

    https://cpc.farnell.com/rean/nys367-...=rca%20sockets

    cpc are quick to deliver and prices are good - they do add a handling charge (not much) so best to order all you need at once.
    They take Paypal and have 'guest' checkout,
    I dislike these. Brass connection. No no imo

    I'd go for the Valab everytime. Yes, they are in Asia somewhere but as its your lucky day, I have 3 pairs here that I'll sell you for cost as I'm in no rush for them.

    Up to you but you won't do better for the money.
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > SIMaudio Moon LP5.3RS
    Digital: Orchard Audio PecanPi with JRiver
    Preamplifier: Neurochrome Differential Preamp
    Amplification: Neurochrome Modulus 686
    Speakers: Mordaunt Short Performance 880
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable

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

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

  5. #5
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 10,019
    I'm Oliver.

    Default

    Quote Originally Posted by Pepperamip View Post
    Thanks Mike ill check them out.

    Sent from my CLT-L09 using Tapatalk
    I've got these but they are bright gold rather than frosted looking.

    Think they are about 10 per pair on ebay.

    Here: https://rover.ebay.com/rover/0/0/0?m...2F323853261876.
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > SIMaudio Moon LP5.3RS
    Digital: Orchard Audio PecanPi with JRiver
    Preamplifier: Neurochrome Differential Preamp
    Amplification: Neurochrome Modulus 686
    Speakers: Mordaunt Short Performance 880
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable

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

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

  6. #6
    Join Date: Dec 2014

    Location: UK, East Midlands

    Posts: 1,539
    I'm Mike.

    Default

    Quote Originally Posted by Bigman80 View Post
    I dislike these. Brass connection. No no imo
    Weird - Rean are gold plated ... not 'brass'.

  7. #7
    Join Date: Jul 2017

    Location: Kent

    Posts: 448
    I'm Paul.

    Default

    Thanks for the offer Ollie but the Attenuator only cost me 18 so no point spending 30 on the rca sockets

    I'll pick up some cheapies for this build but if I ever do something more substantial I'll defo consider the valabs.

    Sent from my CLT-L09 using Tapatalk
    Current system:
    RPi + Allo Digione
    Beresford Caiman Seg & Dorado powered by 15v Linear PSU
    Transcendent Sound Mini Beast OTL
    Amptastic Mini-1
    Klipsch KG4.5 Speakers with Titanium Diagphrams and Sonicap Cap upgrade
    110aH Leisure Battery powers the Mini-1 & Digione

  8. #8
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 10,019
    I'm Oliver.

    Default

    Quote Originally Posted by mikmas View Post
    Weird - Rean are gold plated ... not 'brass'.
    What do you think might be under the gold plating?
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > SIMaudio Moon LP5.3RS
    Digital: Orchard Audio PecanPi with JRiver
    Preamplifier: Neurochrome Differential Preamp
    Amplification: Neurochrome Modulus 686
    Speakers: Mordaunt Short Performance 880
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable

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

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

  9. #9
    Join Date: Nov 2015

    Location: Wolverhampton

    Posts: 10,019
    I'm Oliver.

    Default

    Quote Originally Posted by Pepperamip View Post
    Thanks for the offer Ollie but the Attenuator only cost me 18 so no point spending 30 on the rca sockets

    I'll pick up some cheapies for this build but if I ever do something more substantial I'll defo consider the valabs.

    Sent from my CLT-L09 using Tapatalk
    Fair enough. Completely understand
    Analogue: Technics SP10 MK2 > Phonomac AT-1010 MK6 tonearm > Ortofon Kontrapunkt b > SIMaudio Moon LP5.3RS
    Digital: Orchard Audio PecanPi with JRiver
    Preamplifier: Neurochrome Differential Preamp
    Amplification: Neurochrome Modulus 686
    Speakers: Mordaunt Short Performance 880
    Cables: SPOTFIRE Speaker Cable & SPOTFIRE IC Cables & SPOTFIRE Tonearm cable

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

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

  10. #10
    Join Date: Apr 2012

    Location: Southall, West London

    Posts: 41,517
    I'm Geoff.

    Default

    Quote Originally Posted by Bigman80 View Post
    What do you think might be under the gold plating?
    More gold?
    "when common sense, logic and plausibility are excluded. All that remain are foolishness and lies"

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