Nelson Pass Aleph J

Discussion in 'Solid State Gear' started by opa1, Sep 19, 2017.

  1. opa1

    opa1 Moderator Staff Member

    Would anyone be interested in a build thread of the Aleph J? I'm thinking about this a lot lately. Class A at 25watts.
     
  2. TubeHiFiNut

    TubeHiFiNut Administrator Staff Member

    I'm always up for a fun project.....

    As long as I'm not the one doing the soldering. ;)
     
    StevenZ likes this.
  3. mhardy6647

    mhardy6647 Señor Member

    Yes, absolutely.

    As an aside: I am continually impressed by Nelson Pass's designs, his philosophy, and his willingness to share much of his output with the DIY community.
     
  4. JohnVF

    JohnVF Administrator Staff Member

    I can't say I'd want to build one but if it's anything like my Aleph 30, you're all in for a treat. One of the most non-amp-sounding amps around.
     
  5. opa1

    opa1 Moderator Staff Member

  6. JohnVF

    JohnVF Administrator Staff Member

    Then yes, I can highly recommend that, if you have the skills, go for it. The Aleph 30 is simply an outstanding amplifier. I have used it with a variety of speakers but what it really really loved was my Quad 63 pros. It is natural sounding, full, coherent, can carry a tune and drop it off where you want and then come back for more. Hmm, maybe I should dig it out of the basement. I've not had room for the Quads but it also sounded good with my Harbeths.

    Go for it!
     
  7. mhardy6647

    mhardy6647 Señor Member

    Nelson Pass helps to give transistors a good name...

    ;)

    [​IMG]
     
  8. dowto1000

    dowto1000 Junior Member

    This is a very good choice of amplifier kit, for medium-efficiency speaker users.

    Notice point number 5, in his write up " 15 dB less negative feedback ".

    On a high efficiency speaker system, 98 dB and higher, which is well set up, well wired, and fed by a good source, a person with normal hearing can hear the difference between a low negative feedback amp, ( with any small amount of negative voltage feedback, like this Pass amp you are discussing ), and a ZERO negative feedback amp.

    The problem with 99% of the zero feedback vacuum tube SET amps people use ( on their efficient 98 dB and above speakers ), is that the tube amps used are simply not high enough in overall performance.. The Pass amp will possibly best them, despite voltage or current feedback in the Pass kit amp.

    Now, if you have MEDIUM efficiency speakers, this PASS amp kit may very well be ideal for you !!

    Have fun, I do.


    Dowto1000
     
  9. GuyK

    GuyK Junior Member

    Absolutely I'm interested in following a build thread of one of these!
     
  10. opa1

    opa1 Moderator Staff Member

    I'll build the Aleph J. It will be a bit before I start it. Have to finish the ACA first. :)
     
  11. MikeT.

    MikeT. Senior Member

    opa1 , just out of curiosity, what is the total parts cost for the Aleph J? And how many hours will it take to build? I've always been interested in Class A and in Pass Labs in particular.
     
  12. MikeT.

    MikeT. Senior Member

    You might be able to build it in a day, me not so much.
     
  13. Thermionics

    Thermionics Post Whore In Training

    Do eeet.

     
  14. opa1

    opa1 Moderator Staff Member

    Some of the Aleph parts are out of stock. :(
     
  15. inthewoods

    inthewoods AARP Member

    Interested. Board ordered. I'll keep an eye out for the mosfets also.
     
  16. TubeHiFiNut

    TubeHiFiNut Administrator Staff Member

    Two builds simultaneously.....

    This will be very enlightening to watch. :)
     
  17. marantzfan

    marantzfan Administrator Staff Member

    Ever since selling my F5 ive been contemplating another Pass Class A build...

    I really need to read up on this one. Curious how it compares to an F6.
     
  18. TubeHiFiNut

    TubeHiFiNut Administrator Staff Member

    Now you can understand why I never sell anything anymore. ;)
     
  19. Kyle

    Kyle Junior Member

    YES. I would definitely want to build this. I'm going to pass on future tube projects and I've done a ton of new amp point to point and board refurbs so this should be easy.
     
  20. StevenZ

    StevenZ Active Member

    Subscribed for interest.
     

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