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Thread: Electrocompaniet ECI - 2

  1. #11
    Join Date: Apr 2012

    Location: N E Kent

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    I'm Geoff.

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    Is there a problem? If the amp sounds good, surely all is well?
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  2. #12
    Join Date: Apr 2008

    Location: Warrington

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    I'm Neil.

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    Quote Originally Posted by walpurgis View Post
    Is there a problem? If the amp sounds good, surely all is well?
    Definitely no ‘problems’. It looks like it’ll drive anything apart from 1 Ohm Scintillas.
    Mana Acoustics Racks / Bright Star IsoNodes Decoupling >> Allo DigiOne Player >> Pedja Rogic's Audial Model S DAC + Pioneer PL-71 turntable / Vista Audio phono-1 mk II / Denon PCL-5 headshell / Reson Reca >> LFD DLS >> LFD PA2M (SE) >> Royd RR3s.

  3. #13
    Join Date: Sep 2018

    Location: London

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    I'm Howard.

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    Quote Originally Posted by walpurgis View Post
    Is there a problem? If the amp sounds good, surely all is well?
    The reason is frivolous really. I've set myself a project of exploring Class A amps in one of my systems. Yes, this Electrocompaniet sounds good with the speakers, but I want to know what I've got, especially when the Krell arrives, which I'm more confident will be pure Class A.

  4. #14
    Join Date: Sep 2018

    Location: London

    Posts: 88
    I'm Howard.

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    By the way, another question. Can someone suggest someone to service it? Electrocompaniet aren't interested in the UK, they're a very small operation, one salesman operating from his kitchen table as far as I can see, and he's focused on selling their streaming equipment. The amp sounds fine, but if I think it may not be a bad idea to get someone to look at the insides. I'd give it to a local company, but in fact when I asked them they felt nervous because it was class A, they said.

  5. #15
    Join Date: Sep 2018

    Location: London

    Posts: 88
    I'm Howard.

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    Oh and her's a picture of the front of the amp, not mine as it happens, but that's what it looks like



    It just says in gold and black "Class A" -- if it's not, then I really think it's misleading, very bad form.
    Last edited by Mandryka; 17-03-2019 at 18:04.

  6. #16
    Join Date: Apr 2012

    Location: N E Kent

    Posts: 51,624
    I'm Geoff.

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    By the way Howard. Could you please put a more specific location in your profile? "United Kingdom" is too general, a town or region will be fine. Thanks.
    It is impossible for anything digital to sound analogue, because it isn't analogue!

  7. #17
    Join Date: Sep 2018

    Location: London

    Posts: 88
    I'm Howard.

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    Quote Originally Posted by walpurgis View Post
    By the way Howard. Could you please put a more specific location in your profile? "United Kingdom" is too general, a town or region will be fine. Thanks.
    London, I'll change the profile.

  8. #18
    Join Date: Apr 2012

    Location: Swansea, UK

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    I'm Jayson.

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    A sample of pure Class-A

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  9. #19
    Join Date: Jan 2009

    Location: Essex

    Posts: 31,850
    I'm openingabottleofwine.

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    In an amplifier operating in pure class A the output power will double each time the load impedance is halved, as long as the power supply can provide sufficient current. The Electrocompaniet amplifier shows an increase in power as the load impedance is halved, getting on for nearly double but not quite.

    Also, the standing (or idling) power dissipation will be at least double the maximum output power. Pure class A amplifiers draw constant power from the supply, and can never be more than 50% efficient. As the audio output increases, some of the power is dissipated in the speaker load, but even at maximum output at least half will be dissipated in the amplifier.

    Thus the need for large heat sinks, and even then they get hot.


    I built the amplifier circuit designed by Otala and Lostroh, as reported in the Journal of the Audio Engineering Society (on which the first Electrocompaniet amplifier was based) and it was excellent. About 25W, it sounded lovely into Quad ESLs.


    The Mark Levinson ML2 is the only pure class A amplifier that I know of. A single channel amplifier providing 25W into 8 Ohm, it has an idling dissipation of 400W. As can be seen from the link below, the heatsinks are massive and (from experience) run hot.

    https://stereonomono.blogspot.com/20...nson-ml-2.html
    Last edited by Barry; 18-03-2019 at 01:41.
    Barry

  10. #20
    Join Date: Apr 2016

    Location: London

    Posts: 377
    I'm Richard.

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    Clear as mud Barry, cos electronics wise, I'm as thick as pig shit.
    Glad you posted it though because I've always wondered how it worked technically.
    Someone should make it a sticky!
    Cheers

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