Bryston 7B-ST Pro Series Black Monoblock Amplifiers

(1) Pair of 19” Bryston 7B-ST Pro Series monoblock amplifier. The PRO models have individual gain (input level) controls, located on the front panel as 1/8” screwdriver-adjustable potentiometers. Date code 9927 (July 1999); PayPal fees waved & only shipping to the lower 48 states.

7B ST Specifications
Power Output 500 watts into 8 ohms (series mode)
800 watt into 4 ohms (series mode)
500 watts into 2 ohms (parallel mode)
800 watts into 1 ohm (parallel mode)
Gain 29dB (unbalanced)
23dB (balanced)
Distortion 106dB below full output
Slew Rate Greater than 60 volts per microsecond, parallel
Greater than 120 volts per microsecond, bridged
Power bandwidth Less than 1 Hz to over 100 kHz
Damping Factor Over 300 at 20 Hz, ref. 8 ohms
Input Sensitivity
Balanced • 2 Volts in = 100 watts at 8 ohms
• 4.5 Volts in = 500 watts into 8 ohms Bridged mode
• 2.3 Volts in = 800W into 1 Ohm parallel mode
Input Sensitivity
Unbalanced • 1 Volt in = 100 Watts at 8 Ohms
• 2.2 Volts in = 500 watts into 8 ohms Bridged mode
• 1.2 Volts in = 800W into 1 Ohm parallel mode
Input Impedance 50 Kohms unbalanced
20 Kohms balanced
Features • Series/parallel switch
• Over 6,400 cm2 of heatsinking, over 9,600 cm2 with chassis
• Regulated power supplies to all voltage gain stages
• Gold plated input and output connectors
• Switchable balanced XLR-1/4 inch and RCA unbalanced inputs
• Silver Faceplate Available
A/C Power
Consumption &
Heat Load 1. Idle Current 155W
2. Series Mode 4 Ohms (800W) 1824W
3. Parallel Mode 1 Ohm (800W) 1824W
4. Max. Wattage 1824W
5. Max. Heat Dissipation 1024W / 3495 Btu/Hr

Dimensions 19 x 5.25 x 15.5 inches, wt. 44 lbs
48.25 x 13.33 x 39.4 cm, wt. 20kg