Bryston BRYSTON BP 1.5 MANUAL, BP 1.5 Description, Mute Switch, Mute Relay, Turn On Relay

BRYSTON BP 1.5 MANUAL

BP 1.5 Description

Turn On Relay: Preamplifier Gain:

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.

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.

Figure 3

Page 3