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Thread: The 40th Anniversary Sony VFET Amplifier from Pass Labs

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    Senior Member Odd's Avatar
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    The 40th Anniversary Sony VFET Amplifier from Pass Labs

    At a special press briefing held during the 2014 International CES

    http://blog.sony.com/press/sony-demo...fet-amplifier/

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    Senior Member 1audiohack's Avatar
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    Those are super cool looking. Ill bet they don't sound bad either.

    I want 'em!
    If we knew what the hell we were doing, we wouldn't call it research would we.

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    Senior Member Odd's Avatar
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    Quote Originally Posted by 1audiohack View Post
    Those are super cool looking. Ill bet they don't sound bad either.

    I want 'em!


    So do I.
    I read somewhere they were not for sale, we have to wait and see.

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    Senior Member gferrell's Avatar
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    Sort of reminds me of the old Ashly FET-2000 amps.

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    XPL 200's, XPL 160's, XPL 140's, L7's, L5's, L3's, L1's Homemade L Center, 4412's, 4406, L60T's, L20T's

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    Administrator Mr. Widget's Avatar
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    Quote Originally Posted by Odd View Post
    So do I.
    I read somewhere they were not for sale, we have to wait and see.
    There will be no more... Nelson found the last NOS supply of V-FETs to build them. He built the amps as a tribute and presented them to Sony as a gift.

    Widget

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    Quote Originally Posted by Mr. Widget View Post
    There will be no more... Nelson found the last NOS supply of V-FETs to build them. He built the amps as a tribute and presented them to Sony as a gift.

    Widget
    That sucks...
    S4700 owner.

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    Sony Vfet amps

    Not quite accurate Mr. Widget! Only the last known NOS stash of Sony Vfet's.

    To beg a line from Kief; Gerber files and metal "Are only a shout away, a shout away, just a shout away!" So maybe a couple more channels.

    And yes the sounded really magical in the Sony CES room on the Sony speakers. Best I've ever heard the Sony speakers sound.

    Cyclotronguy

  9. #9
    Senior Member SEAWOLF97's Avatar
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    My daily amp , connected to ESS Heil AMT bookshelves, is a Technics SU-G90 integrated (130 wpc). It is marked "FET direct coupling" and "new class A". Not sure what type of FET it is.

    Running digi files from the computer , it is a great combo (prolly not worth much tho).
    “If you think that’s the dumbest thing you’ve ever heard,
    just wait a couple minutes!”

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    FET Amp

    If you like it, regardless, then I would think it's worth quite a lot!
    The beauty of this hobby, is that whatever puts a smile on your face, works.

    Cyclotronguy

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    Interesting. V FETS are still readily available. I use them all the time.

    Allan.

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    Senior Member Ducatista47's Avatar
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    Quote Originally Posted by Allanvh5150 View Post
    Interesting. V FETS are still readily available. I use them all the time.

    Allan.
    Are those power VFETs, or low power pieces like most JFETs are? Many preamplifier stages use JFETs, but power JFETs of recent manufacture were limited to, I think, two manufacturers, one being now defunct.

    Only the defunct ones (Semisouth) were high voltage units, of interest to electrostatic listeners like myself. When a suitable high voltage amp can be built, no transformers are necessary to drive electrostatic speakers and headphones, eliminating significant distortion. The only common way to build such an amp is to use tubes as the high voltage devices. The available solid state units bootstrap lower spec transistors; not a great way to go. They end up either not producing enough voltage swing to make the high end headphones sound as designed, or operating the transistors out of their design parameters. This is why the only tubes I still use are in a Stax amp from Japan. It still didn't cut it, but a friend modified it for me with higher voltage tubes; he replaced dual triodes with single triode bottles with much higher voltage capability. Some rewiring was also necessary, and it all works beautifully now.

    I could mention that while MOSFETs can make outstanding output devices for audio, JFETs have some remarkable advantages over them. Nelson Pass has all the good ones left. I am lucky to have two of his First Watt power amps equipted with them.

    I would have thought that power VFETs would be big news. What sort of pieces are they?
    Information is not Knowledge; Knowledge is not Wisdom
    Too many audiophiles listen with their eyes instead of their ears


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    Senior Member LowPhreak's Avatar
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    "At a special press briefing held during the 2014 International CES, Nelson Pass announces a few people have won the lottery, or have more money than brains..."


    Good luck.

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    Senior Member 1audiohack's Avatar
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    Unhappy

    Hi Ducatista;

    Just curious, how high is the output voltage of the modified Stax amp you speek of?

    Thank you,

    Barry.

    PS. I have no idea why there is a frowny face on the top of this post and I can't get it off.
    If we knew what the hell we were doing, we wouldn't call it research would we.

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    Although the classic 2SJ56 and 2SK176 and there smaller counterparts are not made now, they are still widely available from various sources. Also, the newer and higher powered 2SJ201 and 2SK1530 are in production and no problem at all to get hold of.

    Allan.

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