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  1. #1

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    Default Pass Zen - Owner Completion

    I bought this owner completion Pass balanced Zen pre amp from someone here who owned it briefly and moved on to something else before finishing it themselves. It only had one pair of SE inputs connected. Thanks to Fred for some Zen tips and suggesting I turn the pre amp board 90 degrees. Relocating the pre amp board allowed for shorter and better routing of wiring.

    I also moved the attenuator/selector forward slightly as clearance was tight by second pair of outputs. I just left it with one pair of balanced/SE outputs. I did connect the two balanced and four SE inputs to the selector. Input/output grounds are star grounded at their respective side of board. I just used twisted pairs from an old chunk of Cat5 cable I had laying around.

    I also wanted a chassis to chassis ground. Rather than look for different umbilical connectors, I eliminated one pos and neg power wire from the original two each to the pre amp board. That freed up two pins and one was used for chassis to chassis ground. I still need to get some parts to secure the toroidals.

    It sounds really good for a simple design with no exotic parts (but the boards do have quality parts). It is quiet, no hiss or hum at full volume no music playing, no spikes/pops from speakers when changing sources. It doesn’t knock my recapped/tuned up Krell KSL pre off the rack, but it is worthy of a really nice enclosure and upgrades.
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    Last edited by SCompRacer; 04-07-2013 at 06:00 PM.
    Make yourself necessary to someone. Ralph Waldo Emerson

    Salk SoundScape 8's
    Krell KRC-HR Class A Pre w/ Reference Phono
    Krell Class A KSA-250
    Harmonic Technology Pro 9+
    Squeezebox Touch / Welborne Labs PS / I2S Out Mod
    Denon 3910 w/I2S/DSD Out
    Twisted Pear Buffalo III Dual Mono ESS Sabre32 DAC
    Sennheiser HD650
    Heavy Plinth Lenco L75 Idler Drive
    AA MG-1 Linear Air Bearing Arm
    AT33PTG/II & Denon 103R
    Shunyata Hydra (Original)
    NHT B-12d subs
    GIK Acoustic Treatments


    CP Showcase

  2. #2
    Audiophile
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    Default

    Congrats! It is a very nice circuit and I'm glad you're getting good use out of it!

  3. #3

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    Default

    That Pass is a sharp fella.
    Nice work Rich,no hum or other extraneous noises is a huge victory for Diy.

  4. #4

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    Quote Originally Posted by FTGV View Post
    That Pass is a sharp fella.
    Nice rework Rich,no hum or other extraneous noises is a huge victory with Diy.
    Fixed

  5. #5

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    Hey Rich! There is a lot of empty space in there for some mods!
    Carl

  6. #6

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    Default

    I dig it! Glad someone picked it up from zingo who was willing to work with it further. That's a pretty preamp.
    USB Interface: Stello U2, Nuforce uDAC2 ║ DAC: Stello DA100 Signature, Keces DA-151 MK2
    Headamp: Darkvoice 336SE, Bottlehead Crack ║ Headphones: Sennheiser HD650, AKG Q701, Audio-Technica ATH-M50
    Amplifiers: PS Audio 200CX, DIY Class D Monoblocks ║ Speakers: Dayton RS621, Focal 807V, LSA1 Statement, Soliloquy 5.3
    Power: Yulong P18, Rotel RLC900, Cyberpower 1000VA PFC UPS

  7. #7

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    Nice Rich! Glad you are enjoying it.
    Taken from a recent Audioholics reply regarding "Club Polk" and Polk speakers:

    "I'm yet to hear a Polk speaker that merits more than a sentence and 60 seconds discussion."

    "Green leaves reveal the heart spoken Khatru"- Jon Anderson

    "Have A Little Faith! And Everything You'll Face, Will Jump From Out Right On Into Place! Yeah! Take A Little Time! And Everything You'll Find, Will Move From Gloom Right On Into Shine!"- Arthur Lee

  8. #8
    Audiophile
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    Quote Originally Posted by schwarcw View Post
    Hey Rich! There is a lot of empty space in there for some mods!
    Like a second PS board and two more transformers...

  9. #9

    Member Sales Rating: (12)

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    Hell yes, get that parts count up!
    Make yourself necessary to someone. Ralph Waldo Emerson

    Salk SoundScape 8's
    Krell KRC-HR Class A Pre w/ Reference Phono
    Krell Class A KSA-250
    Harmonic Technology Pro 9+
    Squeezebox Touch / Welborne Labs PS / I2S Out Mod
    Denon 3910 w/I2S/DSD Out
    Twisted Pear Buffalo III Dual Mono ESS Sabre32 DAC
    Sennheiser HD650
    Heavy Plinth Lenco L75 Idler Drive
    AA MG-1 Linear Air Bearing Arm
    AT33PTG/II & Denon 103R
    Shunyata Hydra (Original)
    NHT B-12d subs
    GIK Acoustic Treatments


    CP Showcase

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