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This Bryston amplifier is working and tested perfectly in our lab and listening room. Some scratches on the top and on the side as shown in the photos.
The "Be" was the first of the new NRB series of amps before Bryston changed the name to NRB. The "e" in "4Be" stands for Engineering.
Note that this is a rare professional model with XLR and Camac connectors (Camac is commonly seen on vintage Mark Levinson pieces). This piece came to us from Sony Studios / Sony Music Entertainment.
More from Bryston:
"Bryston's 4B stereo power amplifier consists of two amplifier modules, each with its own ±85v power supply, which can be operated independently or combined (MONO mode) to form a single 800 watt amplifier (8Ω load) in a 3 rack height chassis. Operated independently (DUAL mode) each channel can deliver 250 watts into 8Ω (or 400 watts into 4Ω). Each of the two amplifier modules use 8 of Bryston's custom power transistors for a total of 16 output devices per 4B."
1Hz – 100kHz, ±3 dB for 1W output
Hum and noise, 108 dB below rated output, 90 dB IHF
1.4V for 250Wpc into 8 ohms
20Hz – 20kHz, 0.01%
IM distortion (60Hz+7kHz, 4:1, SMPTE method):
Less than 0.01% at rated power
Greater than 500 at 20Hz, at 8 ohms (equivalent to an output impedance of less than 0.016 ohms)
50k ohms unbalanced, 30k ohms balanced
16-3/16" (411mm) W
7-1/8" (181mm) H
13-1/2" (343mm) D.
Click here for a PDF copy of the Bryston 4Be / NRB Owner's Manual
Our Testing Process for Amplifiers (Solid State) at SkyFi:
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.
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PURCHASING FROM SKYFI
This item will be professionally packaged and insured for safe transit to your home.
Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.
If we don’t have the original manufacture's packaging, we use heavy duty double ply corrugated boxes with Instapak expanding foam custom inserts. In many cases this has proven to be better than the original packaging. We also use high quality fiber reinforced tape to seal our packages. Lightweight items will be bubble wrapped and shipped in a high-quality box.
This item is available for pickup in Ridgewood, NJ or Union Square, NYC (with convenient parking in the building).
NJ Residents or anyone picking up without a resale certificate will need to pay NJ Sales Tax.
Use the Buy It Now button and we will cover the PayPal fees.
Thanks for looking and be sure to call or text 201.879.0000 with any questions.
Please also click here to visit our Audiogon store to see the rest of the items we have for sale.
WHO WE ARE
SkyFi Audio is a small startup business specializing in the purchase, reconditioning, and reselling of select high-end audio equipment. We only buy equipment the we admire and are passionate about. No mid-fi, no gimmicks, no junk.
Each piece of equipment is cosmetically restored and fully tested in our well-equipped lab by an engineer with 30+ years of experience in the HiFi world. If it does not meet or exceed the original manufactures specifications, it will not be sold. We are very selective about the equipment we purchase, focusing on mostly analog, high-build quality, American, and European built units.
Through our sister company, which is an authorized dealer for McIntosh, Audio Research, Sonus Faber, ClearAudio, Pro-Ject Audio Systems, and Sony ES, we have access to OEM parts, service, and support. If you are local and looking for new equipment from the above-mentioned manufacturers, please drop us a line as we can arrange both sales and professional installation in the tri-state area.
We do not accept or review any offers that do not go through the official Audiogon system. We have too many items for sale and it’s nearly impossible to keep track of offers outside of the official system. Please don’t message, email, or text any offers.
If you do not see a “Make an Offer” button, it means we are not considering any offers on that item.
We prefer working through PayPal which allows you to use a credit card or bank transfer. We do not charge extra for any payment fees if you purchase the item at the asking price. You can also send us a personal check (which will need to clear before shipping), certified check, money order, or wire transfer. International clients without access to PayPal should use a bank wire transfer.
If you are picking up an item we do not accept PayPal. You must pay in person with cash, certified or bank check, or wire transfer. If you make a PayPal payment and are picking up the item, it will be returned.
TRADE IN POLICY
We accept trade-ins of equal or lesser value under certain conditions. Simply ask and let us know the exact model, condition, and the accessories that are included (such as the original box, remote, cables, manual, etc.). We will only consider high-end equipment from mainstream manufacturers such as McIntosh, Mark Levinson, Audio Research, Krell, etc. and will typically pass on displays, projectors, receivers, dated surround processors, and mid-fi equipment of any type. We will offer a fair value for your equipment, but keep in mind we are running a business and will need to be able to resell the equipment at a profit after investing a great deal of time and resources in testing, certifying, repairing, cleaning, and packaging the incoming equipment. If you are looking for top dollar we suggest attempting to sell it directly to an end user on your own.
SELL US YOUR GEAR (Working or Broken)
We will also purchase your used or broken gear and arrange pickup if you are in our local market. Just drop us a note for a quote but be sure to include the condition and what is included.
HOW TO VISIT US
We are currently operating from a residence in Ridgewood, NJ. You are welcome to make an appointment if there is a piece of equipment you would like to see in operation before or after purchase. We have a well-equipped, dedicated listening room with tons of equipment of all makes and models. We are not a store, so please don’t make an appointment if you are just curious as to how a speaker or piece of equipment sounds. In essence, no tire kickers please.
If you are in NYC and cannot make it out to Ridgewood, we can arrange pickup in Union Square (14th Street) after the purchase. You can call or text 201.879.0000 with any questions or to schedule an appointment. We can also arrange to install, calibrate, and tune the gear in your listening room if you are local to the area. This is super useful when purchasing large speakers or heavy amplifiers. It is also great for ensuring your new turntable is setup correctly in its final resting place.