Audio Research LS8 Mk.II

 

SOLD $2,500.00

JUN 2008

 

  • Mint condition

  • Silver Face Plate

  • 1999 - R.R.P. US$2,495.00

  • Owners Manual/Original Box

  • Made In U.S.A.

  • Worldwide Shipping

 

Introduced in 1997 as an affordable, yet reference-caliber single-ended tube preamplifier, the original LS8 model has been reengineered to Mark II status. This change takes advantage of some of the same advancements introduced in our more recent and costly preamplifiers, including the LS16, LS25 and Reference 2.

The new LS8 MKII is a pure Class-A circuit design with a large, fully-regulated power supply and is hand-assembled to the same critical standards as other Audio Research products. MKII component improvements include new regulator FET devices, higher-quality resistors, new Infinicap(r) coupling capacitors and our latest selected 6922 twin triode vacuum tubes. Mechanically, the MKII incorporates new chassis isolation feet, extensive internal chassis damping, and the proprietary clear tube damping rings also used in the LS16, LS25 and Reference 2 models. The cumulative sonic gains are exciting: less smearing with tighter focus of individual instruments, more lucid and natural-sounding upper frequencies, better sorting out of complex orchestral programs, improved dynamics and better bass control and impact. The overall sonic presentation is smoother, more extended in range and more convincingly authoritative.

External appearance and operational controls -- Gain, Input Select, Power On / Off, and Mute / Operate -- are unchanged except for the identifying MKII designation on the rear panel (which sports a removable IEC-type power cord). A factory update to MKII status is available to owners of original LS8 units. Suggested retail for the update is U.S. $495, plus shipping to and from our factory. Updates must be prescheduled through your authorized dealer or through the Audio Research Customer Service Department.

We believe the new LS8 MKII actually outperforms the recently discontinued LS15 when driving a power amplifier with single-ended inputs. There is simply no other preamp in this price range which is better able to provide such refined resolution, musicality and naturalness in a simple-to-operate, easy-to-own package.
 


Specifications:

Frequency response

±.5dB, 0.5Hz to 100kHz -3dB points 0.1Hz and 250kHz

Distortion (THD)

Less then .01% at 2V RMS output (typically .007% in midband)

Noise & hum

20µV RMS IHF weighted noise at main output with gain control at -60dB (100dB below 2V RMS output)

Gain

Main Output - 12.2dB unbalanced

 

Tape output - 0dB

Input impedance

50K ohms

Output impedance

200 ohms main output. Recommended load 60K ohms and 100pF (20K ohms minimum and 1000pF maximum)

Output polarity

Non-inverting

Maximum inputs

3.5V maximum

Rated outputs

 

Power supplies

Electronically-regulated low and high voltage supplies. Line regulation better than .01%

Tube complement

LS8: (4) 6922

 

LS8 MKII: (4) 6922/E88CC dual triode

Power requirements

100-135VAC 60Hz (200-270VAC 50/60Hz) 30 watts maximum

Other

Controls: Gain (64 step, 0.5dB per step for 40 steps), Input selector. Toggle switches: Power On/Off, Mute/Operate.

Dimensions

19" (48 cm) W x 5 1/4" (13.4 cm) H (standard rack panel) x 10 1/4" (26 cm) D Handles extend 1 1/2 " (3.8 cm)forward of front panel. Rear chassis fitting extend 1/2" (1.3 cm).

Weight

10 lbs. (4.5 kg) Net; 19 lbs. (8.6 kg) Shipping.