Accuphase A-250 mono blocks announced!
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  1. #1
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    Accuphase A-250 mono blocks announced!

    I noticed Accuphase have published info on their Japanese website about new A-250 class A mono blocks! Here are the base specs from their website...

    "With the ultimate low noise, the best SN ratio of 127 dB has been achieved, pursuing delicate reproducibility of music freed from noise. The outstanding output of pure Class A 100 W / 8 Ω achieved with the ultimate configuration that operates the non-contact output circuit equipped with "semiconductor (MOSFET) switch" and the power unit of "pure Class A operation" arranged on the left and right side in parallel Damping Factor Acquiring new dimension expression power with strong driving force exceeding 1,000. The A-250 has a dignified style, and it marks a new history as the highest peak of a power amplifier."


    • Pure class A operation, 100 W / 8 Ω high quality power
    • Two fully identical power amplifier units are driven in parallel
    • Output stage is a "power MOSFET" 20 parallel push-pull configuration, linear high power is realized to ultra-low impedance of 1 Ω
    • Input unit introduces double configuration instrumentation amplifier system
    • "Double MCS + circuit" and "current feedback amplifier circuit" are installed in the amplifier
    • Bridge connection using two A-250s can further increase output
    • Strong power supply unit with high efficiency large toroidal transformer and large capacity filter capacitor


    I wasn’t able to translate the PDF, but from the base specs the A-250 mono’s appear to have a slightly better S/N ratio. Other than that, there doesn’t appear to be any major changes. The two models even look identical, other than the model name on the face plate. My guess is they have slightly refined the circuit design & improved some parts, resulting in a very slight improvement in S/N.

    Some would say that Accuphase rest of their laurels too much. OTOH, I like that Accuphase haven’t screwed up a good thing. If it aint broke? Anyhow, the changes should be clearer once Accuphase add the PDF to their English website .



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    Last edited by Melbguy1; May 15, 2017 at 10:38 AM. Reason: added link
    David

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  3. #2
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    Re: Accuphase A-250 mono blocks announced!



    Wow, I never saw this coming. Very nice.
    Joe

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  4. #3
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    Re: Accuphase A-250 mono blocks announced!

    Quote Originally Posted by joeinid View Post


    Wow, I never saw this coming. Very nice.
    Yeah neither did I...I thought the A-200 mono's were a one off, but it appears Accuphase changed their mind after the success of that model.
    David

    Front End:
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    "If music be the food of love, play on" - William Shakespeare

  5. #4
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    Re: Accuphase A-250 mono blocks announced!


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  7. #5
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    Re: Accuphase A-250 mono blocks announced!

    S/N ratio of 127 dB? Very impressive.
    Le Roy

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