EAR/Yoshino LTD. 509 100W Mono Valve Power Amp Amplifiers

509 100W Mono Valve Power Amp

Built to professional standards. Advanced Industrial grade high capacity valves not used in any domestic amplifier. EAR amplifiers proven in studio use. Accurate simple self-biasing for user replacement of valves when appropriate. In professional applications “XLR” input connectors and balanced semi-floating inputs are supplied at a nominal additional cost. Stability - No feedback is used on the transformer secondary - The amplifiers are entirely stable into any load. Matched mono amplifiers are supplied in pairs for stereo.

  • SPECIFICATIONS
  • Power Output (20Hz-20KHz<0.25% THD into Rate
  • Load)...100W
  • Frequency Response 8Hz-30KHz............+0-1dB
  • Frequency Response 3Hz-80KHz..........+0-3dB
  • Power Bandwidth -3dB,0.5% THD.......12Hz-60KHz
  • I.M.D. at any level from 100mW-100W equivalent
  • power...<0.2%
  • Output Damping Factor (0.4ohm + 4uH)....20
  • Signal to Noise Ratio down from 100W.......96dB
  • Input Sensitivity (Unbalanced).........1.2V
  • Input Impedance (Unbalanced).........25Kohm
  • Power Consumption ...................180V.A.
  • Weight .....................18kg
  • Size 12"(30cm)W........10"(25.4cm)D.......6"(15cm)H

  • User Reviews (3)

    Showing 1-3 of 3  
    Iman Hojjat   AudioPhile [Feb 25, 2015]

    i test many pricy pre power like Gryphone encore,Mcintosh MA7000,Krell FPB 600,and some other.but at last i hear this Great amp with 912 pre and i choose it for ever,very natural and musical sound,deep bass,wide clean and sweet and not colored.really i like it and thankful of Mr De Paravicini for this Great design.I use it for my Focal Diablo (bad match speaker)but Ear can drive them very well.

    OVERALL
    RATING
    5
    VALUE
    RATING
    5
    Ben Spiers   Audio Enthusiast [Jun 11, 2007]
    Strength:

    Clean, transparent, musical

    Weakness:

    Makes your previous equipment seem poor

    I replaced my solid state Pre/Power combo (Naim) with these amps, driven by way of a passive pre amp. When I first ran them through my speakers I laughed out loud, then when I re- connected the Naim amps I laughed more! These amps have been one of the biggest, most surprising and cost effective upgrades I have ever made. I call it an upgrade, but they were cheaper than the Naims, which made me laugh again, harder. Huge (but not exaggeratedly so) soundstage, beautiful description of timbre, deep musical bass, airy upper-midrange. These amps have, as they say, got it going on.
    Above price is in pounds Sterling

    Similar Products Used: Naim, Cyrus, Arcam, Creek, Exposure, Radford, Sugden
    OVERALL
    RATING
    5
    VALUE
    RATING
    5
    exmouthdave   AudioPhile [Apr 08, 2006]
    Strength:

    Sheer raw power, neutrality, outstanding base and the ability to drive just about any load.

    Weakness:

    They weigh a ton. so re-enforce your shelves.

    These 100w monoblock are built like tanks, are extremely neutral and do not impose any of their own character on the music. So be warned they do not add the normal warm sound associated with valve (tube) amps. They are however extremely powerful and crystal clear producing an efforless sound with astounding base capability. In my experience they also seem able to drive any speaker you can throw at them. Very neutral and very powerful. Highly recommended.

    OVERALL
    RATING
    5
    VALUE
    RATING
    5
    Showing 1-3 of 3  

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