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EAR/Yoshino LTD. 509 100W Mono Valve Power Amp
2 Reviews
rating  5 of 5
MSRP  4800.00
Description: 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. <li>SPECIFICATIONS <li>Power Output (20Hz-20KHz<0.25% THD into Rate <li>Load)...100W <li> <li>Frequency Response 8Hz-30KHz............+0-1dB <li>Frequency Response 3Hz-80KHz..........+0-3dB <li>Power Bandwidth -3dB,0.5% THD.......12Hz-60KHz <li>I.M.D. at any level from 100mW-100W equivalent <li>power...<0.2% <li> <li>Output Damping Factor (0.4ohm + 4uH)....20 <li>Signal to Noise Ratio down from 100W.......96dB <li>Input Sensitivity (Unbalanced).........1.2V <li>Input Impedance (Unbalanced).........25Kohm <li>Power Consumption ...................180V.A. <li>Weight .....................18kg <li>Size 12"(30cm)W........10"(25.4cm)D.......6"(15cm)H


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Reviews 1 - 2 (2 Reviews Total)

User Reviews

Overall Rating:5
Value Rating:5
Submitted by Ben Spiers a Audio Enthusiast

Date Reviewed: June 11, 2007

Bottom Line:   
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

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Used product for:   Less than 1 month

Duration Product Used:   Audio Enthusiast

Product model year:   Pre 1995

Price Paid:    $800.00

Purchased At:   Second hand



Overall Rating:5
Value Rating:5
Submitted by exmouthdave a AudioPhile

Date Reviewed: April 8, 2006

Bottom Line:   
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.

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Used product for:   More than 1 year

Duration Product Used:   AudioPhile

Product model year:   Pre 1995




Reviews 1 - 2 (2 Reviews Total)

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