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Thread: STK404-140S Question

  1. #36
    Old Timer J M Fahey's Avatar
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    Hey, killer job, congratulations

    Thatīs a beefy aluminum bracket your friend made; is is a piece of L shaped extrusion or a bent piece of thick aluminum plate?

    Your idea of mounting is flawless, you both strongly mounted new module *and* old supply (which is quite more complex than I thought) in available space and put power amp heatsink in the best possible place.

    Donīt consider this "wasted time" at all, but getting your feet wet on what will soon become the only (realistic) way to keep modern "orphan" amps working.

    As always, the "electronic" side of the work is reasonable; the mechanical/fabrication/metallurgical side is the deal killer for 95% "normal" Techs, simply because itīs completely unrelated and requires a set of machinery (specially shears and bending brakes).

    In the early days I was helped by local people making tin stuff: buckets, AC/ventilation/chimney ducts, farm animal feeding trays, etc. , but most have dissappeared (and the few remaining are too large to cater to neighbours) because today such stuff is bought ready made at Home Depot, Wal Mart and such, made hundreds or thousand miles away.
    Oh well.
    Juan Manuel Fahey

  2. #37
    Supporting Member The Dude's Avatar
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    The aluminum bracket was milled on a CNC machine out of a solid block of aluminum. It would probably be easier for someone to bend something up, but I'm lucky enough to have a friend with skills and access to expensive tools.
    J M Fahey likes this.
    “Yeah, well, you know, that’s just, like, your opinion, man.”

  3. #38
    Old Timer J M Fahey's Avatar
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    These guys took the bull by the horns and made their own STK module:

    https://www.ebay.com/itm/STK-0050-Mo...8AAOSwaZJZhmtX



    Since postings donīt lst much, hereīs the direct link to sellers:
    https://www.ebay.com/usr/bobandelain...p2047675.l2559
    nickb and The Dude like this.
    Juan Manuel Fahey

  4. #39
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    Quote Originally Posted by J M Fahey View Post
    These guys took the bull by the horns and made their own STK module:

    https://www.ebay.com/itm/STK-0050-Mo...8AAOSwaZJZhmtX



    Since postings donīt lst much, hereīs the direct link to sellers:
    https://www.ebay.com/usr/bobandelain...p2047675.l2559
    That layout is so much cleaner than in any of the STK modules (real or fake) earlier in the thread. It's a smart move, surprised they aren't selling populated kits. Those PCBs probably cost $0.50 even in low volume.

  5. #40
    Supporting Member The Dude's Avatar
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    Yes. And, it's repairable at component level. Once you've retrofitted it, you're good to go.
    nickb likes this.
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  6. #41
    "Thermionic Apocalypse" -JT nickb's Avatar
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    Quote Originally Posted by J M Fahey View Post
    These guys took the bull by the horns and made their own STK module:

    https://www.ebay.com/itm/STK-0050-Mo...8AAOSwaZJZhmtX



    Since postings donīt lst much, hereīs the direct link to sellers:
    https://www.ebay.com/usr/bobandelain...p2047675.l2559
    Sadly, I really don't think that will work as a drop in replacement as it's missing the voltage amplifier stages. They just have the current amplifier section. Take a look at the block diagram of the actual STK404-50:

    stk404-50bd.jpg
    Experience is something you get, just after you really needed it.

  7. #42
    Old Timer J M Fahey's Avatar
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    Nobody said itīs a replacement for STK>>404<<50 but straight STK-0050 , a different model, and which gives you just the "power pack" and leaves the rest of the amplifier in the designer's hands.
    STK0050 pdf, STK0050 Descripcion, STK0050 datasheets, STK0050 Vista ::: ALLDATASHEET :::

    Specifically designed to repair "STK-0050 Replacement for SX-780 and others"

    These guys offer the design for free, including Gerbers and such :
    STK-0050 replacement for SX-780 and others | Audiokarma Home Audio Stereo Discussion Forums

    A full amp based on a smaller brother but basically same idea:
    Juan Manuel Fahey

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