Bryston 3B Solid State Stereo Amplifier

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This is a well-performing vintage amp from Bryston. Bryston is found in studios throughout the world because of its neutrality and reliability.

This 3B is no exception as it worked admirably in our tech bench without needing a bit of maintenance.

Cosmetically it's free of dents or serious wear, but the black anodizing has faded as is typical in most units this age.

Click below to add our recommended matching cables from Kimber Kable, all brand new as SkyFi is an official Kimber dealer.

Kimber Kable - RCA Interconnects

Kimber Kable - Speaker Cables

Technical Specifications:
Amplifier Output Class
AB

Rated Power Output
100 Watts Per Channel at 8 Ω
200 Watts Per Channel at 4 Ω
400 Watts In Bridged / Mono Mode at 8 Ω

Frequency Response
20 Hz - 20 kHz

Signal-to-Noise Ratio
100 dB

Crosstalk
Below 100 dB

Total Harmonic Distortion
0.05 %

Intermodulation Distortion
0.025 %

Slew Rate
60 Volts / microsecond

Sensitivity
1.0 Volts

Damping Factor
500 @ 20 Hz

Dimensions (W x D x H)
19" x 9" x 5.25"
[48.26 x 22.86 x 13.34 cm]

Weight
35 lbs.
[15.89 kg]

The SkyFi Testing Process for Solid State Amplifiers:
We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage.

We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally, we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If everything reads clean, we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier then remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will be also be tested.

Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage KEF speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice.