Scrap-lifier MkII; 4ch, 50w, Fully Regulated 35-0-35 PSU. Sounds Amazing!

Scrap-lifier MkII; 4ch, 50w, Fully Regulated 35-0-35, 12A PSU. Sounds Amazing!

Front of chasis, with power and Main and Slave-Output volume controls.

Front of chasis, with power and Main and Slave-Output volume controls.

4 channel dual-stereo mono-block for Passive Bi-amping.

Stereo mono-block layout with dual transformers.

Stereo mono-block layout with dual transformers.

Independent power regulators for each stereo pair – and we really mean POWER!

Power PSU Regulators in close-up.

Power PSU Regulators in close-up.

And she’s just survived her first 24hrs in use with the lid on without blowing-up. An excellent Stage-2. Sound is dynamic with solid bass and loads of headroom. Noise is undetectable, even at maximum gain. Stereo imagery is precise and it’s presentation is as smooth as one could ask.

I think we’ve found our new demonstration amplifier.

About Alacrity Audio

Designed and built in the UK, Alacrity Audio’s loudspeaker systems offer unbelievable sound quality in convenient close-to-wall designs.
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2 Responses to Scrap-lifier MkII; 4ch, 50w, Fully Regulated 35-0-35 PSU. Sounds Amazing!

  1. Zeca says:

    Dear Cooperweed,
    I saw some comments from you on diyaudio related to this hybrid amp you have assembled with LM3886+6N11 . I was checking comercial amps like Unison Research Unico, which is also a hybrid, and found that thread. Any idea if this diy kits, using chip amps, really can match that high end quality ? Or if we want that audio quality, detail, bass, clearness, — ,, we must pay THAT price ? For sure it is funny to play diy, and say “I built this” but to get that audio quality, that’s another league and you must take your wallet out, if you can.
    Regards
    Zeca

    • Hi Zeca

      There are pros and cons to the DIY-audio world, that’s for sure. On the one hand, we get to play with class-leading components and I bet we’re mixing with world-class design talent on this forum, but on the other; we’re amateurs, coming-up with our own layouts and procedures, sometimes on-the-fly, without much back-up in the way of test and measurement. That we even bother, I think, makes us amazing!

      Those UR Unicos are that price because they have to buy a CNC machine and PCB robot and turn out the first one or two, send them off to be Certified as safe, meanwhile paying the trained staff and interest on the business loans and rent on their premesis, and only expect to sell maybe ten a year. Every pound you spend on DIY is representative of 10 to 20 quid of a Retail price.
      But, they’ve got the advantage of being able to experiment, while we’re stuck with the PCB layout as it was when we bought it, which, certainly in the case of the Scraplifier’s 6N+LM, can be compromised.

      For me, I’m not out to produce the-best-amp-in-the-world, just one that’s better, waaay better, than the one I can afford to buy.
      Something the Scraplifier Mk II has shown is that ‘noise’ is not rooted in the amplifier board. You can’t tell when the Volume control is all the way up or all the way down. She’s not completely silent (what woman ever is..?) but the noise-level is the same at zero volume or eleven.

      cw

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