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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