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Thread: Why not DIY amp

  1. #1
    Senior Member John W's Avatar
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    Why not DIY amp

    I was just about to put my two cents in on a separate thread discussing amps from the 70s and 80s when the thread was closed. So, here goes a new discussion.

    I have used various amp/preamp or integrated amps from this era, both tube and solid state, including vintage Yamaha ns, Dynaco and Pioneer sx models. To me, nothing compares to my DIY amps I built from here.

    http://sound.westhost.com/project101.htm

    I built both a 240w/ch and an 80w/ch version. They are dead quiet till the signal hits then they just sing. My ears could be colored somewhat with the pride of constructing it myself, but so what, that’s what I like about this hobby.

  2. #2
    Senior Member Lancer's Avatar
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    Let's see some pictures!

    I like Rod Elliott's projects.

  3. #3
    Senior Member John W's Avatar
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    I will post some tonight. They don't let me bring the stereo equipment to work.

  4. #4
    Senior Member John W's Avatar
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    Here is the high power one. The front is a carbon fiber panel that I had from another project, the sides are some salvaged heatsinks and the rest is 1/8 aluminum from Boeing surplus. It would be better if the heatsinks ran vertically but the amp stays suprisingly cool, so it isn't an issue.
    It has a large toroidal transformer. Main filtering is 4 25000uf salvaged computer caps and then 2 4700uf for each channel. Once you switch it off, it keeps playing for another couple of minutes on its own.
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  5. #5
    Senior Member John W's Avatar
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    Here is the smaller amp. It is built on a Dynaco 120 chassis that had a busted channel. There really isn't much left of he original amp. The Dynaco never sounded so good.
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  6. #6
    RIP 2011 Zilch's Avatar
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    WHOA! Mondo TOROIDUS

    Those're MIGHTILY cool....

  7. #7
    Senior Member pmakres1's Avatar
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    Cool!

    Your high power amp is way cool!

    And oh yes, those are the most unusual Stereo 120 innards I've ever seen!

    In my youth I built a Stereo 80, 2 PAT-4's and I had a factory assembled Stereo 120. The Stereo 120 was a lemon and a half...to the best of my knowledge the Stereo 80 still works today! (my brother has it).

    At least you got some use from the 120 chassis!!

    Peter

  8. #8
    Senior Member Wardsweb's Avatar
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    I've never tried to build a solid state amp. All my stuff has been tubes. From custom one off creations



    to modifed kits


  9. #9
    pelly3s
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    hmmmm that gives me an idea with my st-120 chassis, I bought one for $75 and the thing met its match when it got hooked to a speaker with a dead short in the crossover. I hated the sound of the thing anyways. Those are some cool looking toys. If I only had money lol

  10. #10
    Senior Member Ian Mackenzie's Avatar
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    Nice job John,

    Yes Rod Elliott does pump out good projects.

    Here's a snap of my 1st diy amp, an Aleph 2 clone (Passlabs).

    Makes a great foot warmer in winter and you really can't beat the sound if you don't mind burning 300 watts at idle!

    This little one is my favourite, pumps out 37 watts in 8 ohms, 70 into 4 ohms and is biased at 8 amps. Nothing touch's the sound.

    Ian
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  11. #11
    Senior Member John W's Avatar
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    Those are some nice tube amps. Where did you find the nice chrome chassis for your top picture?

  12. #12
    Alex Lancaster
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    All of Your DIY´s look great, wish I could do that.

  13. #13
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    About 30 years ago I got an ST-120 and an ST-70 from a friend. I sold the ST-120 a couple of years later. I still have the ST-70, although it has been rebuilt. The ST-120 is probably in a landfill by now.

  14. #14
    Senior Member pmakres1's Avatar
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    Stereo 120

    Quote Originally Posted by bbrown
    About 30 years ago I got an ST-120 and an ST-70 from a friend. I sold the ST-120 a couple of years later. I still have the ST-70, although it has been rebuilt. The ST-120 is probably in a landfill by now.
    From my own experience and from nearly everyone else I've heard from, the Stereo 120 simply was not a reliable design.

    Peter

  15. #15
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    I have been tempted to build an amp based on Marshall Leach's design for his engineering calss. It is supposed to be very good. You can check out the design here:

    http://users.ece.gatech.edu/~mleach/lowtim/

    Bruce

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