Audio Research Reference 600 mk II

The ultimate high power tubed amps.


POWER OUTPUT: 500 watts continuous at 16 ohms from 20Hz to 20kHz with less than 1% total harmonic distortion (typically less than .05% at 1 watt).

Actual maximum power available (at the point of clipping) is dependent upon the following:
1) power line voltage.
2) power line condition (ie: regulation, distortion).
3) type and brand of power output tube used.

Typical power under average circumstances will be around
550 watts. Maximum power under ideal conditions will be around 600 watts.

POWER BANDWIDTH: (-3dB points) 12Hz to 80kHz.

FREQUENCY RESPONSE: (-3dB points at 1 watt)
2Hz to 200 kHz. INPUT SENSITIVITY: 2.0V RMS balanced for rated output.

INPUT IMPEDANCE: 200K ohms balanced.

OUTPUT REGULATION: Approximately 0.5dB 16 ohm load to open circuit (Damping factor approximately 16).

OVERALL NEGATIVE FEEDBACK: 12dB.

POWER REQUIREMENTS: 105–125VAC 60Hz (210–250VAC 50Hz) 1600 watts at rated output, 2200 watts maximum, 800 watts at idle, 300 watts standby.

TUBES REQUIRED: 8 Matched pair 6550C Power Output; 4-6550C Regulators; 3-6N1P Input/Follower; 8-6H30 Driver. The REFERENCE 600MKII has sufficient bias adjustment range to allow the use of any of the following output tube types: 6550, 6550B, 6550C, KT88, KT90, KT91, KT100.

The REFERENCE 600MKII as supplied from Audio Research is equipped with the Russian 6550C, which is our current choice for reliability and long service.

DIMENSIONS: 19" (48.3 cm) W x 10.5" (26.7 cm) H x (29.5" (74.9 cm) D. Handles extend 1.5" (3.8 cm) forward.

WEIGHT: 170 lbs. (77.2 kg) Net; Shipped in pairs, 495 lbs. (225 kg) per pair.

Specifications subject to change without notice.