Bryston bp 15 owners manual
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Page 1
GENERAL INSTRUCTIONS Input Capacitance Loading for MM Section: Warranty Information: Thank you for choosing a Bryston product. We welcome any suggestions you may have, or comments regarding the operation of your am- plifier. We consider you, our customer, to be Brystons most important resource, and your opinion is very much appreciated. Bryston products are warranted to be free from manufacturing defects for a minimum of 20, (twenty), years from the original date of manu- facture. This includes all parts, labor and one- way return shipping. This warranty covers the original owner and any subsequent owners. The warranty is retroactive for any Bryston product purchased within the last twenty years. Tam-pering by anyone other than factory authorized personnel voids the warranty. Warranty service may be obtained by returning the unit to any authorized Bryston dealer or distributor. You may also contact the Bryston factory or national service offices directly at the location listed on the rear page of this manual. Please keep the original box and all packing material. This will ensure the amplifier is pro- tected in the unlikely event you have a problem and must return it for service. No warranty card is necessary to initiate your coverage. Please refer to the back page for more detailed war- ranty information. 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 (4 capacitors for the left and 4 capacitors for the right channel). This en- sures the correct amount of capacitance across the phono cartridge to provide accurate per- formance. Each switch adds in one capacitor (47 pf). Switches 1 to 4 add capacitance to BOTH LEFT and RIGHT inputs simultaneously . Any or all of the DIP switches may be activated ( placed in the upper position for On ) at one time or, in the lower position (Off), meaning no capacitance is placed across the phone inputs. As each ca- pacitor is switched in the total capacitance in- creases cumulatively Total value for each chan- nel is 188 pf per channel (See Figure 4, Page 4) The Bryston BP1.5 Phono Stage is a high qual- ity broadcast grade Phono Stage offering both Moving Magnet and Moving Coil cartridge step- up capabilities. The BP1.5 comes with an separate outboard power supply to minimize noise and distortion. The BP1.5 can be used without an additional power supply if you currently own a Bryston BP20 or BP25 Preamplifier. The outboard power supply for the BP20/25 can be utilized to power the BP1.5 as well with the supplied ca- ble. (See Figures 1 and 2 , Page 5) Bryston BP1.5 Description: PLEASE REFER TO: BRYSTONS SAFETY MANUAL FOR FURTHER OPERATING INSTRUCTIONS.
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Turn On Relay: The BP1.5 utilizes an output shunting relay with approximately a 3 second delay at start-up to allow any system transient/thumps to settle out before connecting the signal. The front panel LED turns Red on power up and clicks to Green when status is confirmed. Mute Switch : The Manual MUTE switch on 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. Mute Relay : When you power down the BP1.5, by turning off the outboard power supply the mute relay is activated and the LED will go from Green to Red. then Off This prevents any power supply decay artifacts from reaching the outputs. Preamplifier Gain: BP1.5 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 35dB of gain but can be adjusted with an inside jumper to 41dB gain. (See figure 3, Page 3) The Moving-Coil mode adds an addition gain stage to the MM stage with a step-up trans- former. This step-up transformer has adjust- ments for gain as well. It can be set for 22.5dB or 16.5dB of gain. It is factory set for 22.5dB as this will facilitate 90% of the MC cartridges available. The standard gain of 22.5dB accom- modates cartridges with outputs of less than 40 ohms impedance. The 16.5dB of gain is for cartridges of 40 to 150 ohm output impedance. BRYSTON BP 1.5 MANUAL Page 3 BP 1.5 Description Figure 3