BRYSTON
PREAMPLIFIERS
Input
and
Output Connectors:
Bryston preamplifiers are
equipped
with
five
pairs
of
RCA
input
connectors,
two
pairs
of
balanced
XLR
i.nput
connectors
and
one
pair
of
RCA
tape
input
jacks.
The
balanced
inputs,
(pin-l
ground,
pin-2
posi-
tive
and
pin-3 negative)
All
inputs
employ
fully dis-
crete active
input
circuitry.
Two
pairs
of
RCA
main
outputs,
one
pair
of
RCA tape
outputs
and
one
pair
of
balanced
XLR
outputs
are also
provided.
All
input
and
output
connectors
on
the
BP-20
and
BP-25
are
gold-plated.
Only
cables
with
high
quality gold
plated
connectors
should
be
used
with
your
preamp
to
avoid
noise
and
distortion
from
the
corrosion
which
will
eventually
appear
on
poorly
plated cable
connectors.
Bryston
offers
RCA
or
XLR
cables
with
con-
nectors
gold-plated
to
20
microinches,
(up to
30
times
heavier
than
standard
gold-flashed
cables).
Standard
1
and
2
meter,
or
custom-length
cables, are available.
Bryston
BP-25
Remote
Control:
The
Bryston model BP-25
is
supplied with a
hand-held remote control unit.
The
remote features in-
clude Volwne control, Mute,
and
Polarity
Invert
.
All
remote control functions may
be
operated manually from
the front panel
of
the preamplifier
if
desired.
The
Volwne
Control
is
a motor-driven design.
This approach ensures the lowest distoltion with maxi-
mwn
long term reliability
The
Polarity-Invert switch allows you to reverse
the absolute phase
of
the aueLo signal, (not to be confused
with left-versus-right channel
phase
), because polarity
reversal can occur
in
the recording chain.
(In
fact,
our
investigations
show
th
at polarity
is
not
consistently main-
tained
in
commercial recorcLngs
).
It
is
desirable to main-
tain absolute phase as originally played
in
the recoreLng
hall,
as
that will provide the
most
accurate representation
of
the original wavefront. This may be audible
in
some
cases
as
a more realistic reneLtion
of
musical transients
when
the
proper
polarity for that recording
is
selected.
The
Bryston BP-20/ BP-25 preamplifiers maintain non-
inverting polarity
at
t11e
Main
output
for
all
inputs when
the pilot light
is
green, and inverting polarity for
all
inputs
when
the
LED
is
yellow.
The
'To
Tape'
outputs are
always non-inverting
The
Mute
control
mutes
the
output
of
the
preamplifier to
allow
for interruptions
without
affecting
the
volwne
control setting. (Refer also to the
Power
Supply section
of
this instruction sheet for information
regarding remote Amplifier control via the Mute switch
).
Bryston
MM
and
MC
Phono
Section:
Bryston's
Phono
section
is
available
in
the BP-20
or
BP-25 preamplifiers. It features state-of-the-art accu-
ral)'
in
equalization, extremely low noise and eLstoruon,
and provides headroom margins sufficient to prevent
overload from any
known
phono
source.
The
Phono
section may
be
ordered
in
either
of
two versions: Moving-Coil,
(lvI
odel BP-20MC
or
BP
-
25MC),
or
Moving-Magnet, (lvIodel BP-20P
or
BP-25P
).
The
BP-20MC and the BP-25MC provides a front panel
switch to choose the adeLtional
gain
required for
moving
coil cartridges
(See
diagram page 4)
To
access the
Phono
section
on
theBP-20MC
or
BP-25MC, simply
plug
your tu01table interconnect leads
into the
Phono
inputs
on
the rear panel
of
the preampli-
fIer
.
Engage
the
MM/MC
Pbono
toggle-switch located
on
the front panel
of
the preamplifier to the appropriate
moving-magnet
or
moving-coil position and
tum
the
"S
ource" rotary selector
knob
on
the front panel to
Phono.
(please ensure the [v[lvi/MC switch
is
in
the
correct position for your cartridge,
or
your system
will
eLsplay aueLble problems, such as
poor
frequenl)'
re-
sponse
, low
output,
or
both).
If
your
turntable provides a
separate
ground
lead, system noise may be minimized by
connecting it
to
the
ground
lug adjacent
to
the
phono
inputs
on
the rear panel.
The
BP-20P
and
BP-25P
hookup
procedure
is
similar, with the exception that there
is
no front panel
switch between
IvI1vf
and
MC
(This
is
replaced with the
Stere
o/
Mono
switch).
The
Bryston BP-20 and BP-25 are line-level
preamplifiers only.
You
may acquire Moving-Magnet
or
Moving Coil
phono
capability
by
returing it to the factory
for updating
We
also offer the Moving-Coil setup stage,
as an outboard
unit
(TF-l
),
if
your preamplifier already
contains a Moving-Magnet
phono
section.
Page 3
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