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Input and Output Connectors:
Bryston preamplifiers are equipped with five
paits of RCA input connectors, two pairs of balanced
XLR input connectors and one pair of RCA tape input
jacks. The balanced inputs, (pin-1 ground, pin-2 post-
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
Bryston BP-25 Remote Control:
The Bryston model BP-25 is supplied with a
hand-held remote control unit. The remote features in-
clude Volume control, Mute, and Polarity Invert.
All
remote control functions may be operated manually from
the front panel of the preamplifier 1f desired.
The Volume Control is a motor-driven design.
This approach ensures the lowest distortion with maxt-
mum long term reliability.
The Polarity-Invert switch allows you to reverse
the absolute phase of the audio 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 that polarity is not consistently main-
tained in commercial recordings). It is desirable to main-
tain absolute phase as originally played in the recording
Bryston MMM and MC Phono Section:
Bryston's Phono section 1s available in the BP-20
or BP-25 preamplifiers. It features state-of-the-art accu-
racy in equalization, extremely low noise and distortion,
and provides headroom margins sufficient to prevent
overload from any known phono source.
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The Phono section may be ordered in either of
two versions: Moving-Coil, (Model BP-20MC or BP-
25MC), or Moving-Magnet, (Model BP-20P or BP-25P).
The BP-20MC and the BP-25MC provides a front panel
switch to choose the additional gain required for moving
coil cartridges Gee diagram page 4).
To access the Phono section on theBP-20MC or
BP-25MC, simply plug your tumtable interconnect leads
into the Phono 'inputs on the rear panel of the preampli-
fier . Engage the MM/MC Phono togple-switch located
on the front panel of the preamplifier to the appropriate
moving-magnet or moving-coil position and tum the
"Source" rotary selector knob on the front panel to
and BP-25 are gold-plated.
Only cables with high
quality gold plated connectors should be used with
your pteamp 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.
hall, as that will provide the most accurate representation
of the original wavefront. This may be audible in some
cases as a more realistic rendition of musical transients
when the proper polarity for that recording is selected.
The Bryston
BP-20/BP-25 preamplifiers maintain non-
inverting polarity at the Main output for all inputs when
the pilot light is green, and inverting polarity for all inputs
when the LED 1s yellow.
The "lo Tape' outputs are
always non-inverting.
The Mute control mutes the output of the
preamplifier to allow for interruptions without affecting
the volume control setting.
(Refer also to the Power
Supply section of this instruction sheet for information
regarding remote Amplifier control via the Mute switch).
Phono.
(Please ensure the MM/MC switch is in the
correct position for your cartridge, or your system will
display audible problems, such as poor frequency te-
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.
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The BP-20P and BP-25P hookup procedure 1s
similar, with the exception that there is no front panel
switch between MM and MC. (This is replaced with the
Stereo/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 (IF-1), if your preamplifier already
contains a Moving-Magnet phono section.
Page 3
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