AUDIO RESEARCH REFERENCE 300 BLOC MONO TUBES 300 W LA PAIRE OCCASION

280 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 290 watts. Maximum power under ideal conditions will be around 300 watts.

(-3dB points) 12Hz to 100kHz

(-3dB points at 1 watt) 0.5Hz to 160 kHz

1.75V RMS balanced for rated output. (32dB gain into 16 ohms)

200K ohms balanced

1, 2, 4, 8, 16 ohms

Approximately 0.8dB 16 ohm load to open circuit

10dB

Approximately 11

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Less than 0.2mV RMS –110dB below rated output (IHF weighted, input shorted, 16 ohm output)

Approximately 448 joules

105–125VAC 60Hz (210–250VAC 50Hz) 900 watts at rated output, 1200 watts maximum, 480 watts at idle, 280 watts standby

REFERENCE 300: (4 matched pairs) 6550C power output, (4) 6550C regulators, (1) 6922 regulator amplifier, (4) 6922 driver, (4) 6922 input. The REFERENCE 300 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 300 as supplied from Audio Research is equipped with Russian 6550C, which is our current choice for reliability and long service. REFERENCE 300 MKII: (4 matched pairs) 6550C power output, (4) 6H30 triodes, (3) matched 6A57, (2) 6N1P.

19" (48.3 cm) W x 10½" (26.7 cm) H x 23½" (59.7 cm) D. Handles extend 1½" (3.8 cm) forward

132 lbs. (59.9 kg) Net; Shipped in pairs, 410 lbs. (186 kg) per pair