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Home  >  Turntable Gear > Phono Preamps

Bryston - BP-1.5 - Outboard MM and MC Phono Stage

Bryston - BP-1.5 - Outboard MM and MC Phono Stage
Bryston - BP-1.5 - Outboard MM and MC Phono Stage Bryston - BP-1.5 - Outboard MM and MC Phono Stage Bryston - BP-1.5 - Outboard MM and MC Phono Stage Bryston - BP-1.5 - Outboard MM and MC Phono Stage Bryston - BP-1.5 - Outboard MM and MC Phono Stage
Item Number: BYBP1.5
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High-quality, Broadcast-grade Phono Stage

The huge library of music present on vinyl represents an irreplaceable treasure. As such it becomes more important than ever to reproduce the music with the greatest faithfulness to the original recording.

The Bryston BP1.5 is a high quality, broadcast grade phono stage offering both Moving Magnet and Moving Coil cartridge step-up capabilities. It features one pair of power supply input and outputs plus one pair of RCA inputs and outputs.

"A Terrific Product and Well Worth the Price"

"It's a terrific product and well worth the price," notes John E. Johnson, Jr., in his March 24, 2011 review for Secrets of Home theater and High Fidelity. "It is very neutral and very clean. There is no particular range of frequencies, such as the lows, mids, or highs, that are in your face. It is extremely smooth and easy to listen to."

Phono Gain

The BP 1.5 includes two different amplifier modes to accommodate both MM (moving-magnet) and MC (moving-coil) phono cartridges.

The moving-magnet mode comes factory set at 35 dB of gain, but can be adjusted with an inside jumper to 41dB gain. The moving-coil mode adds an additional gain stage to the MM stage with a step-up transformer. This step-up transformer has adjustments for gain as well. It can be set for 22.5 dB or 16.5 dB of gain. It is factory set for 22.5 dB as this will facilitate 90% of the MC cartridges available. The standard gain of 22.5 dB accommodates cartridges with outputs of less than 40 ohms impedance. The 16.5dB of gain is for cartridges of 40 to 150 ohm output impedance.

Input Capacitance Loading for Moving-Magnet Section

The Moving-magnet input capacitance switch is located on the rear panel and consists of a four element DIP (Dual In Line) switch and eight high precision capacitors. Four capacitors for the left and four capacitors for the right channel. This ensures the correct amount of capacitance across the Phono cartridge to provide accurate performance.

Mute Switch

The Manual MUTE switch on the front panel can be activated at any time. This switch mutes the output and is indicated by the front panel LED turning from Green to Red.

Note: The BP-1.5 does not have its own power supply. It requires either the Bryston BP-26 Preamplifier or the MPS-2 outboard power supply for operation.

Owner’s Manual 300 k PDF)

  • MM / MC phono stage
  • 1 pair Power supply input and outputs
  • 1 pair RCA inputs and outputs
  • 17-inch or 19-inch faceplate
  • Black or silver finish
  • Frequency response (with inverse RIAA filter): MC mode, between 20 Hz to 20 kHz, less than +/- 0.5 dB; MM mode, between 20 Hz to 20 kHz, less than +/- 0.1dB
  • Rated output: 5 Volts RMS
  • High level sensitivity: MM mode, 5 mV; MC mode, 500uV
  • Distortion: Less than .005% IM or THD, any frequency or combination of frequencies from 20 Hz - 20 kHz at rated output
  • Rated noise: (with A Weighting filter): MM mode, -80 dBA, referred to an input of 5 mV RMS @ 1 kH; MC mode; -80 dBA referred to an input of 0.5, mV RMS @ 1 kHz
  • Gain: MM mode, 35 dB or 41 dB (internally changeable); Factory set gain, 35 dB; MC mode, 51.5 dB , 57.5 dB or 63.5 dB (internally changeable); Factory set gain, 57.5 dB
  • Dimensions: 17" or 19" wide, 7.2" deep, 1.75" high

"My overall impression of the Bryston BP-1.5 is that it is very neutral and very clean. There is no particular range of frequencies, such as the lows, mids, or highs, that are in your face. It is extremely smooth and easy to listen to. It is also quiet. I could not detect hiss or hum (a phono preamp after all is dealing with amplification of very small voltages, and if it is not laid out properly, hiss and/or hum will work its way into the sound)."

"It's a terrific product and well worth the price, especially if you already have a Bryston component with the MPS-2 power supply."

- John E. Johnson, Jr., Secrets of Home theater and High Fidelity, March 24, 2011

How are components selected and installed in a Bryston product?

Starting with a bare circuit board each component is hand selected and installed, every wire is cut and bent by hand, every connection is hand soldered. Although Bryston could do the job much faster by employing wave-soldering machines typically used in large assembly operations, that would mean exposing the entire board to a molten-metal bath. This is a source of extreme heat shock that could result in long-term reliability problems. Bryston's focus on excellence just doesn't allow for these kinds of short-cuts.

How many hours does it take to build a Bryston product?

The skilled technicians that build Bryston products are not pressured by schedules or quotas. On average, it takes 30-35 person hours to assemble a single Bryston amplifier or preamplifier. The company believes in quality, not quantity.

What kind of product testing does Bryston do?

Frequent inspection and extensive testing are a critically important part of the Bryston assembly process.

Individual components, completed circuit-boards, sub-assemblies and final assemblies are all put through rigorous inspection and testing procedures. Are the soldering joints all clean? Is every component aligned properly? Is the internal wiring laid-out symmetrically and neatly? During every stage of production, quality and performance are checked - and rechecked - against exacting tolerances and specifications.

At the point of final assembly, many manufactures immediately pack their amplifiers into boxes for shipment. However, at Bryston, each of the fully assembled products is connected to what the company calls a "burn-in table." For example, during 100 hours of continuous testing, Bryston amplifiers are monitored through a range of input cycles and thermal stress levels to duplicate a broad spectrum of operational loads. If any failures occur, the company catches them here, before you begin using our product.

Then, and only then, are Bryston products sent to the final quality inspection area for a comprehensive and carefully documented test of all their functions. The printed results of this computer-aided analysis are actually shipped with each unit. During this intensive procedure, Bryston rejects any product that falls outside of advertised specifications, or an even narrower band of specifications used for internal testing. As a result, you can expect each Bryston product to perform as least twice as well as the advertised specifications.

What kind of manufacturer's warranty do Bryston products have?

The Bryston manufacturer's warranty is unprecedented in the consumer electronics market.

Bryston analog audio circuits are warranted to be free from manufacturing defects for twenty (20) years from the original date of manufacture. The warranty includes parts and labor.

Bryston Digital circuits and cables are warranted for five years from the original date of manufacture. The warranty includes parts and labor.

Bryston products having motorized moving parts, excluding motorized volume controls, are warranted for three years from the original date of manufacture. The warranty includes parts and labor.

In the event of a defect or malfunction, contact Bryston's repair centers for return authorization.

Bryston MPS-2 Power Supply

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