Bryston BP 1.5 User Manual

                                           
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. 
 

 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. 
 

 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.  

Page 3 

  
 
 
 
 
 
Figure 3