David Berning Quadrature ZDavid Berning  Quadrature Z as new "mint"Highendaudionut@gmail.com with questions. If you know these amp at all you know they are very very special. Both single and balanced input, all balanced amplification. Special triode-like screen...22000.00

David Berning Quadrature Z as new "mint" [Expired]


no longer for sale

Highendaudionut@gmail.com with questions. If you know these amp at all you know they are very very special. Both single and balanced input, all balanced amplification. Special triode-like screen-drive output stage. Low negative feedback, no phase compensation 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. Separate shielded enclosure for power supply reduces noise. Power consumption: idle-125 W; max-500 W. Power factor corrected. Line voltage required: 100-260 VAC, 50-440 Hz. Signal to noise: broadband (typical) 55 dB, all feedback settings. 20 kHz bandwidth (typical): 98 dB, NORM feedback; 92 dB, MED feedback; 86 dB, LOW feedback. All figures unweighted. Distortion (typical, at 8 ohm loads at 200 W): 0.3%, NORM feedback; 0.5%, MED feedback; 1%, LOW feedback. These double at 4 ohms. Typical output power at onset of clipping: 8 ohms 220 W; 4 ohms 270W. Frequency response at 5 W, 8 ohms; +0, -3 dB: 2 Hz to 90 kHz, NORM feedback; 2 Hz to 60 kHz, MED feedback; 2 Hz to 40 kHz, LOW feedback. Frequency response at 5 W, 4 ohms; +0, -3 dB: 2 Hz to 50 kHz, NORM feedback; 2 Hz to 40 kHz, MED feedback; 2 Hz to 30 kHz, LOW feedback. Full power bandwidth (-3 dB), 4 ohms: 20 Hz to 50 kHz, NORM feedback; 20 Hz to 36 kHz, LOW feedback. Low frequency bandwidth limit intentionally set by speaker protection (0dB down at 20 Hz). Typical output impedance (measured at 1 amp, 60 Hz): 0.8 ohms, NORM feedback; 2 ohms, MED feedback; 5 ohms, LOW feedback. Sensitivity, 200 W, 8 ohms: 1V, single-ended input. Feedback gain compensated. Input impedance: 35 k -50 k, depending on feedback setting, both single-ended and balanced inputs. Tube complement: (4) 33JV6 output; (2) 16GK6 driver; (3) 12AT7 input and gain. Size: 48 cm wide, 48 cm deep, 20 cm high, (19 X 19 X 8 inches), including connectors and feet. Net weight: 15 kg (32 lb); Boxed, 17 kg (38 lb). Finish: silver face and back anodized aluminum; top and sides: light gray paint with silver anodized accent bars. Also available in black anodized aluminum by special order. Comes equipped with Stillpoints TM isolation feet.
Seller Information

draudio 
draudio  Verified Dealer

Last 12 months
All-time102899.7%

Member since May 2012

Items from this seller