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David Berning
david-berning  

David Berning(デビッド バーニング)

David Berning is considered to be one of the world's most respected amplifier designers. 20 years ago, after 20 years of designing and manufacturing tube amplifiers, Berning turned tube amplifier technology on its ear: In 1996 Berning invented the the ZOTL (Zero hysteresis Transformer-Less) architecture. Radically different, it was and is still considered the most significant improvement to tube amplifier technology since the 60s.

Berning's ZOTL amplifiers consistently garner stellar reviews and recommendations from the world's top audio reviewers and magazines. In fact, his ZH-230 amplifier continues to receive the Absolute Sound Magazine "Editor's Choice Award" every year since 2011. The Berning Quadrature Z amplifier won HiFi+ magazine's "Product Of The Year" award for 2009. And last year, Berning developed the 211/845 amplifier which sells for many tens of thousands of dollars. It was introduced at the Munich High End Audio Show last year.

Berning's previous amps such as the ZH-270, EA-2101 many others are still highly sought after as timeless examples of Berning's tube amplifier genius.

http://davidberning.com/


David Berning ZH-230 Dual 30w Audio Amplifier David Berning ZH-230 Dual 30w Audio Amplifier David Berning ZH-230 Dual 30w Audio Amplifier  

 

David Berning ZH-230 Dual 30w Audio Amplifier
希望小売価格 ¥1,680,000(税別)

ZOTL Technology in this dual 30 watt package provides faithful amplification, high reliability, and uniquely allows for automatic biasing of various combinations of tubes. ZH-230 features low-weight, cool operation, constant output impedance, tight regulation, and high fidelity amplification. A Class-A 12 Watt single-channel version is also available.

  • All balanced amplification.
  • No phase compensation for feedback used.
  • Constant output impedance over entire audio spectrum.
  • Built-in five-stage power-line filter and surge suppressor.
  • Non-magnetic chassis prevents skin-effect induced distortion.
  • Power consumption: idle-110 W; max-300 W. Power factor corrected.
  • Line voltage required: (universal) 100-240 VAC, 50-440 Hz.
  • Signal to noise: broadband (typical) 60 dB, all feedback settings. 20 kHz bandwidth (typical): 85 dB to 105 dB, depending on tube complement. All figures unweighted.
  • Distortion (typical, at 8 ohm loads at 30 W): 0.3 % to 0.7 % These double at 4 ohms.
  • Typical output power at onset of clipping: 8 ohms 36 W; 4 ohms 36W.
  • Frequency response at 5 W, 8 ohms: +0, -0.6 dB @ 30 kHz.
  • Frequency response at 5 W, 4 ohms: +0, -2,7 dB @ 30 kHz, +0, -1.5 dB @ 20 kHz.
  • Low frequency limit: 0 dB down @ 20 Hz, but repetitive waveforms into 4 ohms below 20 Hz activates speaker protection.
  • Typical output impedance (measured at 1 amp, 60 Hz): 0.6 Ohms to 2.7 Ohms, depending on tube complement.
  • Sensitivity at 30 W output: 8 ohms: 0.4 V RMS to 0.75 V RMS, depending on tube complement and load impedance.
  • Input impedance: 50 kOhm
  • Size: 42 cm wide, 30 cm deep, 17 cm high, (16.5 X 12 X 6.75 inches), including connectors and feet.
  • Net weight: 7 kg (15 lb); Boxed, 9 kg (20 lb).
  • Finish: silver anodize

 

 

 

 


 

ZOTL Pre One Audio Preamplifier ZOTL Pre One Audio Preamplifier ZOTL Pre One Audio Preamplifier

 

 


ZOTL Pre One Audio Preamplifier
希望小売価格 1,680,000(税別)

ZOTL Technology provides in Pre One an unusually robust output drive to effectively overcome interconnect cable parasitics and, optionally, directly drive headphones. This uncommonly powerful output capability ensures that signal fidelity at the preamp is maintained and faithfully propelled to the amplifier.

  • Dc-coupled line stage with dc offset null servo.
  • Dc output protection shutdown.
  • No negative feedback used in either the phono or line stage.
  • Non-magnetic chassis prevents skin-effect induced distortion.
  • Power consumption: 35 W ac powered, or 24 W dc powered (12 V @ 2 A).
  • Line voltage required: (universal) 100-240 VAC, 50-440 Hz.
  • Signal to noise, high-level stage, 20-20 kHz: 90 dB referenced to 1 V RMS input, unweighted.
  • Signal to noise, phono only, without MC step-up transformer: 60 dB ref. 10 mV RMS input @ 1 kHz, unweighted.
  • Signal to noise, phono only, with MC step-up transformer: 56 dB ref. 1 mV RMS input @ I kHz, unweighted. Transformer configured for 1:8 ratio.
  • Distortion, almost all 2nd harmonic: High impedance load ~ 0.5 % @ 2 V RMS output; 50 Ohm load ~ 2 % @ 1 V RMS output.
  • Maximum output: Hi-imp.- 5 V RMS @ 3 % THD; 50 Ohm- 2.5 V RMS @ 7.5 % THD.
  • Frequency response @ 2 V RMS output both High- imp load and 50-Ohm load: -0.5 dB at 20 kHz and + 0.2 dB at 20 Hz. Ref 0 dB at 1 kHz.
  • Output impedance: 50 Ohms.
  • High level gain: 12 dB maximum.
  • RIAA phono gain @ 1 kHz, no transformer: 48 dB. Additional 17 dB with transformer set to 1:8 configuration. 1:12 and 1:24 configurations also available.
  • Phono overload: 110 mV RMS @ 1 kHz no transformer. 14 mV with transformer (1:8).
  • High-level input impedance: 56 k? max, can be as low as 12 k? with balance attenuators set to minimum and volume control turned full clockwise.
  • Tube complement: (4) 12AU7 high-level stage; (2) 12AX7 + (2) 12AT7 phono stage.
  • Size: 42 cm wide, 33 cm deep, 15 cm high, (16.5 X 13 X 6 inches), including connectors and feet and knobs.
  • Net weight: 6 kg (13 lb); Boxed, 8 kg (18 lb).
  • Finish: silver anodize

 

 

 


 



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