Bryston BP 1.5 User Manual

BRYSTON

OWNER’S MANUAL

Instructions For Bryston

Phono Stage

Model BP 1.5

GENERAL INSTRUCTIONS

Warranty Information:

Thank you for choosing a Bryston product. We
welcome any suggestions you may have, or
comments regarding the operation of your am­plifier. We consider you, our customer, to be
Bryston’s 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 manu­facture. This includes all parts, labor and one­way 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-

Bryston BP1.5 Description:

The Bryston BP1.5 Phono Stage is a high qual­ity broadcast grade Phono Stage offering both
Moving Magnet and Moving Coil cartridge step­up capabilities.

The BP1.5 comes with an separate outboard
power supply to minimize noise and distortion.

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 pro­tected 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 war­ranty information.

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 ca­ble.

(See Figures 1 and 2 , Page 5)

Input Capacitance Loading for MM 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 (4 capacitors for the left
and 4 capacitors for the right channel). This en­sures the correct amount of capacitance across
the phono cartridge to provide accurate per­formance.

Each switch adds in one capacitor (47 pf).

PLEASE REFER TO: “BRYSTON’S SAFETY MANUAL” FOR FURTHER OPERATING INSTRUCTIONS.

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 ca­pacitor is switched in the total capacitance in­creases cumulatively Total value for each chan­nel is 188 pf per channel
(See Figure 4, Page 4)

BRYSTON BP 1.5 MANUAL

BP 1.5 Description

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 trans­former. This step-up transformer has adjust­ments 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 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.

Figure 3

Page 3

BRYSTON BP 1.5 MANUAL

Bryston’s BP1.5 Specifications:

Frequency response: (With Inverse RIAA filter)

MC mode; Between 20Hz to 20KHz less than
+/- 0.5 dB.
MM mode; Between 20Hz to 20KHz 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 20Hz-20kHz at
rated output

Rated noise: (with A Weighting filter)
MM mode; -80 dBA referred to an input of 5 mV
RMS @ 1kHz
MC mode; -80 dBA referred to an input of 0.5
mV RMS @ 1kHz

Gain:

MM mode; 35 dB or 41 dB (internally change­able). Factory set gain; 35dB
MC mode; 51.5 dB , 57.5 dB or 63.5 dB
(internally changeable). Factory set gain; 57.5
dB

Features:

1 pair Power supply input and outputs
1 pair RCA inputs and outputs

Dimensions:

17 x 7.2 x 1.75 inches

43.2 x 18.3 x 4.5 Cm

Weight:

5.1 lbs, 2.3 Kg

Options:

19 inch faceplate
19 inch Rack Mount Ears
Silver faceplate

Figure 4

Page 4

BRYSTON BP 1.5 MANUAL

Typical Hookup:

Shown below is a typical hookup using a BP 1.5 Phono Preamplifier with and without a
Bryston BP 25 Preamplifier.

Figure 1 and 2

Page 5

BRYSTON 20 -YEAR WARRANTY

Bryston products are warranted to be free from
manufacturing defects for a minimum of twenty
years from the original date of manufacture. This
includes parts, labour and return shipping to the
first owner and all subsequent owners. Warranty
coverage is automatic and commences with the
original date of manufacture which is kept on file
at Bryston.

In the event of a defect or malfunction, Bryston
will remedy the problem by repair or replacement,
as we deem necessary, to restore the product to
full performance.

This warranty is considered void if the defect,
malfunction or failure of the product or any
component part was caused by damage ( not
resulting from a defect or malfunction ) or
abuse while in the possession of the customer.
Tampering by persons other than factory
authorized service personnel, or failure to fully
comply with Bryston operating instructions,
voids the warranty.

This warranty gives you specific legal rights
and you may also have other rights which may
vary from province to province and country to
country.

FOR BRYSTON SERVICE OUTSIDE CANADA:
CONTACT YOUR LOCAL DISTRIBUTOR
OR CHECK OUR WEB SITE AT:
[e-mail]
OR
CALL BRYSTON DIRECTLY AT:
PHONE: [phone]
FAX: [phone]

P.O. BOX 2170, 677 NEAL DRIVE

BRYSTON LTD.

PETERBOROUGH, ONTARIO

CANADA K9J 7Y4

PHONE: [phone]

FAX: [phone]

BRYSTON SERVICE U.S.A.:

30 COVENTRY ST.

NEWPORT VERMONT.

U.S.A. 05855

PHONE: [phone]

FAX: [phone]

POWER SUPPLY

MPS-1

TO PREAMPLIFIER

BP1.5

TURNTABLE

FIGURE 1

TO RIGHT/ LEFT SIDES OF AMPLIFIER RCA / XLR INPUTS

BP1.5

TURNTABLE

BP20
OR

BP25

POWER SUPPLY

MPS-1

FIGURE 2

FIGURE 3

INSTRUCTION FOR MM INPUT CAPACITANCE LOADING SWITCH

Maximum input capacitance is 188pf

Total input capacitance is 141pf

Total input capacitance is 94pf

Total input capacitance is 47pf

There is no input capacitance in this case

FIGURE 4