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Finish — Black
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Available
Stock availability
Available
330 W monoblock output
One amplifier channel per enclosure.
Six KT170 output tubes
ECC83/6H30 input stages and tube-regulated supply.
Automatic tube bias
Operating-condition management without routine manual bias adjustment.
Balanced or single-ended input
Four/eight-ohm speaker taps and system-control connections.
Product details
The Audio Research Reference 330M is a monoblock power amplifier with a vacuum-tube signal path and a specified output of 330 watts. Each amplifier handles one audio channel, allowing a stereo system to use separate power amplifiers for its left and right loudspeakers.
Tube stages and automatic bias
Six KT170 output tubes work with ECC83 and 6H30 input-stage tubes. A 6550 and another 6H30 serve the power supply, retaining tube regulation within the design. Automatic bias manages the output-tube operating conditions, reducing the need for manual bias adjustment during normal use.
Connections and system control
Balanced XLR and single-ended inputs provide source compatibility, with four- and eight-ohm speaker taps for matching suitable loudspeakers. Twelve-volt trigger connections and RS-232 control support coordinated operation within a larger system. A standby mode provides a lower-consumption state between listening sessions. Black and Natural Silver finishes offer a choice of presentation around the visible tube architecture and front display.
Specifications
- Type
- Vacuum-tube monoblock power amplifier
- Specified output
- 330 W per monoblock
- Output tubes
- 6 × KT170
- Input tubes
- 1 × ECC83; 1 × 6H30
- Power-supply tubes
- 1 × 6550; 1 × 6H30
- Bias
- Automatic
- Inputs
- Balanced XLR; single-ended
- Speaker taps
- 4 Ω; 8 Ω
- System control
- 12 V triggers; RS-232
- Standby
- Power-saving standby mode
- Finishes
- Black; Natural Silver
Dimensions
- Manufacturer-listed weight, each
- 101 lb
