This excellent Bryston 4B amplifier has recently been professionally inspected and had a new power cord installed (see pic of receipt). The tech who serviced the amp said, "This is best made amp I have ever seen."
What others say about the Bryston 4B. "The Bryston 4B is something of a legend. As our most popular model, it has attained international status as an amplifier suitable for the finest and most sophisticated sound systems."
"This power amp is built like a TANK. 55 pounds of quality, 200 watts per channel, power that will drive speakers with demanding loads without breaking a sweat! I can't believe the solid deep bass and the crystal clear highs. The mid-range is smooth and silky without the grain like other amps at this price. Bryston has a 20 year warranty that transfers to the new owner. This one is a keeper. You can't go wrong with anything Bryston!"
Description: Solid-state stereo power amplifier. Output power: 250W continuous into 8 ohms (24dBW), 400Wpc rms continuous into 4 ohms (23dBW); 800W continuous into 8 ohms in bridged mode (29dBW). Current delivery: 16A continuous, 48A peak, per channel. Frequency response: 1Hz–100kHz, ±3dB for 1W output. S/N Ratio: hum and noise, 108dB below rated output, 90dB IHF. Input sensitivity: 1.4V for 250Wpc into 8 ohms. Voltage gain: 30dB. THD+noise: 20Hz–20kHz, 0.01%. IM distortion (60Hz+7kHz, 4:1, SMPTE method): less than 0.01% at rated power. Damping factor: greater than 500 at 20Hz, at 8 ohms (equivalent to an output impedance of less than 0.016 ohms). Input impedance: 50k ohms unbalanced, 30k ohms balanced. Polarity: non-inverting.