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4B-NRB

Name: Bryston 4B-NRB
Brand: Bryston

Bryston

4B Series1991 – Present

AmplifiersPower AmplifiersDiscontinued

Estimated price (community-sourced)

$1,250

About the 4B-NRB

The Bryston 4B-NRB is a class-AB2 dual-mono stereo power amplifier renowned for its rugged construction, exceptional reliability, and powerful performance. Introduced as an evolution of the original 4B from 1976, the NRB version features improvements like higher rail voltages (85V), multiple small filter capacitors, toroidal transformers, balanced inputs, input buffering, and a soft-start circuit. It excels in bass control, speed, and current delivery (up to 40-50A peaks), making it ideal for dynamic loudspeakers. Popular in studios and hi-fi setups since the late 1980s/early 1990s, it offers bridged mono operation and comes with Bryston's legendary 20-year warranty. Units from that era remain functional today.

Specifications

Key Specifications

Power: 250W

Full structured specifications are available to members.

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