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Thread: class A amp project for Mark

  1. #31
    Senior Member richluvsound's Avatar
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    Hi Ian ,

    nice work . I heard Guido's DIY pass at the weekend. If those are half as good then Mark is a very lucky man.

    Rich

  2. #32
    Senior Member Hoerninger's Avatar
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    Quote Originally Posted by Ian Mackenzie View Post
    My favourite tool..the big drill. Image of 24mm hole's being drilled for the connectors.
    Great pictures - great posting, Ian.
    How do you manage the rectangular holes?
    ___________
    Peter

  3. #33
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    Quote Originally Posted by Hoerninger View Post
    Great pictures - great posting, Ian.
    How do you manage the rectangular holes?
    ___________
    Peter
    With great difficulty.

    I really would like a milling machine. I basically mark out the hole and vary carefully drill it out. I then use a fine saw (tiny) and cut through all thedrills holes . Then carefully file the edges using a lubricant. Each hole takes an hour.

    Ian

  4. #34
    Senior Member Hoerninger's Avatar
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    Ian, that is the way I have learned it.
    I feel with you.
    ___________
    Peter

  5. #35
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    Quote Originally Posted by richluvsound View Post
    Hi Ian ,

    nice work . I heard Guido's DIY pass at the weekend. If those are half as good then Mark is a very lucky man.

    Rich
    Thanks Rich,

    It will be interesting. This design, the X Aleph is a balanced (Super Symmetry tm SE) version of the Aleph . Basically that means lower distortion (2nd harmonic) and more dynamics and better bass (particularly lower power versions).

    Its like an Aleph on steriods.

    Here is a link to my first X Aleph I built some years ago

    http://www.passdiy.com/gallery/alephx-p1.htm

    The Aleph 2 is still my favourite Aleph and its easy to make.

    I also have a Zen V9 and a First Watt F4 I will be building shortly.

    Ian
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  6. #36
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    Just finished matching all the power Fet..took 3 hours. They are all within the span of 4.18 - 4.28 VGS.

    Had a breather at about midnight watching Bruce Willis and some Dawwggy diving competitions in a pool in the city on a N.Y tonight show. That as different.

    Ian

  7. #37
    Administrator Robh3606's Avatar
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    Hello Ian

    It's Dawwwgg

    Nice Amp!!

    Rob

  8. #38
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    The plating looks very good. Basically everything with the exception of the heatinks have ben plated. Difficult to photograph in harsh lighting

    Almost fully re-assembled the chassis. It took about 4 hours to reassemble both chassis from my engineering frame drawing..each panel is coded.

    Looks the part.


    Ian
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  9. #39
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    Hello and Happy New Year.

    Been busy in the kitchen (in joke in the Pass Diy divison)

    Attached are some images of the project in the final stages.

    For the most parts its gone according to plan although it runs a little warmer than I would like. The wiring shown is for testing only.

    Some data.

    The transformer is 626 va, 21 volt secondaries @11.9 amps, supply capacitors 22,000 @ 50 volts x 12, high speed Hexfet rectifiers, 16 IRF240 power fets, total dc bias 5.33 amps, maximum power 120 watts into 8 ohms
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  10. #40
    Senior Member richluvsound's Avatar
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    Nice Work

    Happy Year Mate !!!!

    Ian,

    they look brilliant ! Are you happy with the overall sound ? Do they demonstrate the Pass qualities we worship ?

    Rich

  11. #41
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    The design is an upscaled version of this:

    http://www.passdiy.com/gallery/alephx-p1.htm

    See the last paragraph..I wrote that several years ago.

    Ian

  12. #42
    Senior Member Guido's Avatar
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    VERY NICE Ian.

    Did you manage to get rid of the transformer hum?

    Ahhh Panasonic FC's

    I used Elna Silmics this time.

  13. #43
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    Hi Guido,

    It was something else in the room oddly enough.

    Now almost completely silent.

    The key is to use a transformer 7 x the power output and have it wound for now noise. My transfomer as quad secondaries

    I have some Elna Silmics, I will try them.

    Its like small stove when it switched on!

    Anyone for a Barbi...

    Ian

  14. #44
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    I bit more progress.

    After testing for two weeks I connected them to the JBL.

    The sound, in a word "spooky".

    There are some other things I need to sort out and will post details next weekend.

    Ian

  15. #45
    Senior Member Guido's Avatar
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    Quote Originally Posted by Ian Mackenzie View Post
    The sound, in a word "spooky". Ian
    Spooky good, or spooky bad

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