Bryston 4B SST Amplifier - Big Power
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Bryston 4B SST Amplifier - Big Power
479 South Broad Street
Glen Rock NJ 07452
300W powerhouse from Canadian maker Bryston, known for neutral and reliable amplifiers.
This is the amp to have if you want to just hear your speakers and the recording and nothing more.
Beautifully built utilizing dual toroidal transformers and high quality components.
In very good condition with only slight signs of use.
Bryston Ltd. is a Canadian company which has been designing and manufacturing audio equipment for over 35 Years.
While there are many companies competing in their market, Bryston’s gear is coveted by enthusiasts and professionals alike. They have earned the reputation of providing bullet-proof reliability, high performance and value.
Single-ended RCA unbalanced inputs and XLR balanced inputs. 5-way binding posts for outputs. Standard IEC power cord.
Accurate to the recording
8 - Very Slight Signs of Use
Working perfectly and tested in our lab.
Just the unit and power cord
Original Manufacturers Packing
5.25″ H x 17.25″ W x 19″ D
Link to Manual:
Kimber Kable - RCA Interconnects - Better
Kimber Kable - Speaker Cables - Better
Kimber Summit Series BiFocal XL Bi-Wire Speaker Cables (PAIR) - Best If Applicable
Kimber Kable - Power Cords - Better
We start with a visual inspection of all internal components to make sure that there are no signs of heat stress or damage. Capacitors are checked for telltale signs of predictive failure including bulging, shrunken wrappers, or physical leakage. We also inspect the PCBs for discoloration from resistors or transistors that may have been running hot. On vintage units we often spot check select capacitors for value and ESR.
If the amplifier passes visual inspection, we move on to a controlled power on sequence using a Sencore safety analyzer to monitor current draw in real time. Once the amplifier is determined to be safe to operate, we connect it to full AC mains for function and power testing. We connect the speaker outputs of the amplifier to a Sencore PA81 Power Analyzer which acts as a dummy load, DC offset monitor, and oscilloscope interface. We start with a low level 1KHz test signal at the amplifier’s input and slowly increase its amplitude while monitoring the output on an oscilloscope for signs of noise, clipping, distortion, or improper channel balance. We continue increasing the signal level until the amplifier reaches clipping. At this point we take an output power measurement and compare it to the spec sheet of the amplifier to verify proper performance. If the device under test has both balanced and single ended inputs they are both tested at this time. We finish off the bench evaluation with a 1KHz square wave check and a 20Hz to 20KHz sine sweep to assess the amplifier’s frequency response characteristics. This battery of tests will usually reveal if the amplifier has any issues that need further attention.
Before the device leaves the bench, we perform a listening test with actual music using a variety of preferred test tracks. Our benches are outfitted with familiar monitor speakers which help us identify inconsistencies that will not always show up on our test gear. The main things that we are listening for are hum or noise with no signal present, proper center image, clicks, pops, or any other obvious undesirable audio characteristics.
If the unit passes all of these tests it is moved to our long term testing rig where we simulate real word operating conditions for 6-8 hours. This allows us to monitor the unit for signs of thermal runaway or intermittent issues that only crop up when the unit has fully come up to temperature.
Two-Channel Solid State Power Amplifier
300 Watts RMS x 2 into 8 Ohms
500 Watts per channel into 4 Ohms
1 Hz – 100 kHz
RCA Unbalanced, XLR Balanced
50 kOhms Unbalanced, 20 kOhms Balanced