brat [Vând] Amplificatoare: Forte Audio 1A (Nelson Pass) -Clasa A , Nikko 440 si 220
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Thread: Amplificatoare: Forte Audio 1A (Nelson Pass) -Clasa A , Nikko 440 si 220

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    Mar 2005

    Amplificatoare: Forte Audio 1A (Nelson Pass) -Clasa A , Nikko 440 si 220

    -------------------------------------------------------------
    Forte Audio 1A (Nelson Pass) - amplificator de putere -
    2 x 50 W Clasa A

    10 tranzistori pe canal , 48000 uf pe canal , transformator toroidal masiv

    Pret 2700 Ron

    -------------------------------------------------------------
    Nikko Alpha 440 amplificator de putere dotat cu tranzistori bipolari
    2 X 220 W RMS @ 8Ohm 20~20000 Hz
    Raspuns frecventa : 20 - 100000 Hz , +0 -1 dB

    Necesita stabilizator/convertor 220-110 V (se gaseste la 200 Ron)
    Functioneaza fara nici o problema cu convertor, se poate face proba
    Stare buna

    Pret 1200 Ron
    ---------------------------------------------------------
    Nikko Alpha 220 amplificator de putere dotat cu tranzistori bipolari
    2 X 120 W RMS @ 8Ohm 20~20000 Hz
    Raspuns frecventa : 10 - 100000 Hz , +0 -1 dB

    Necesita stabilizator/convertor 220-110 V (se gaseste la 100 Ron)
    Functioneaza fara nici o problema cu convertor , se poate face proba
    Stare foarte buna
    Pret 600 Ron

    Cate ceva despre tranzistorii bipolari: (nikko alpha 220 foloseste 2sa1095/2sc2565, nikko alpha 440 - 2sa1095A/2sc2565A )

    "Toshiba produced ring-emitter devices for a relative short period: the 2SA1095 and 2SC2565.

    Simply put, a ring-emitter device consists of a great number of transistors on 1 die.
    Which translates in a large SOA with an unusual curving, and a very high bandwidth.
    The 1216/2922 have a 40 MHz bandwidth, the 1215/2921 do 50 MHZ.
    Toshiba's 150 watt 2SA1095/2SC2565 devices even higher at 60 MHz.
    High bandwidth translates in high speed, in return this requires less feedback correction.
    Less feedback is favorable for low TIM distortion.
    Ring-emitter's have a high Hfe, which reduces the current capability of the driver devices, and consequently less current gain from the front end of the amplifier.

    These devices are considered the best by many.
    Besides many Japanese companies, a great many other audio companies have used the ring-emitter's for output stages.
    Nelson Pass for a short period on Forte Audio models, Per Abrahamsen in Electrocompaniet power amps.
    In Germany companies as Dieter Burmester in his Burmester 828, Reinhard Wachoviak in the Audiolabor Stark."

    de pe audioreview.com ( este vorba de nikko alpha 220)

    " I let one of these get away from me in the early 80's!
    I lived in Seattle and Mila Nesterovich, who designed a lot of Macintosh stuff, moved to Seattle to work for Speakerlab.
    Anyone remember them?
    He also opened Nesterovich Labs, and made Speakers and tube amps.
    He recommended Nikko amps to people who couldnt afford his tube amps!
    Mila used to say " THE NIKKO AMPS dont have Metallization"
    In his russian accent!
    Metallization was Mila"s term for a bright, etched presentation!
    Wanna hear Metallization?
    Go get you an Onkyo m 504, an old Pioneer spec 1, some early Adcoms, and youll see.
    The alpha 220-230 series of amps are free of this.
    No, they arent Krells, but they sound good, and are super reliable.
    They lack the very last degree of 3 dimensionality compared to the very best, but they are without glare.
    You would have to spend mucho dollars to really beat em, so if you can find one, get it and enjoy!
    You can thank MILa"

    Strengths:
    sound, reliability,,liquidity, smoothness, long term musical

    Weaknesses:
    hard to find,


    -----------------------------------------------------------------------

    Profigold PGA4103 3m Subwoofer Interconnect Cable
    Lungime 3 metri , OFC 99,96%, 24k Gold Plated contacts
    Pret : 40 Ron
    ----------------------------------------------------------------------
    Cablu Boxe Atlas Equator 2 x 2 metri
    3.0 sq mm 99.9997% pure oxygen free copper conductors
    Concentric multi-stranded conductors
    Pret 100 Ron
    Attached Thumbnails Attached Thumbnails nikko 440-3.jpG   nikko 440.JPG   Forte1A-2.JPG   Forte1A.JPG   Forte1A-1.JPG  

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