PS Audio BHK Signature Preamplifier Instructions For Use Manual - page 14
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Getting Started
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15-071-01-1
Rev A
Getting Started
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Owner’s Reference
BHK Signature Preamplifier
TRIGGER SETTINGS
The BHK Preamplifier offers twin trigger output ports. These ports are located on the rear panel of
the BHK Preamplifier, and are labeled Trigger Out. Triggers are 12 volt switches designed to control
connected equipment. When the BHK Preamplifier is switched from the Ready Mode (Standby) from
the front panel PS logo button, to the Operation Mode, the trigger output will switch from OFF to
produce +12 volts. When connected to a compatible piece of equipment, such as a power amplifier,
the trigger will turn on or off the power amplifier. Thus, pressing the front panel button to turn on the
BHK Preamplifier, will also turn the rest of the system on.
The trigger function includes an adjustable delay. It makes sense to let the preamplifier have a few
seconds to start warming up before turning on the power amplifier with the trigger jack. To set the
delay time, enter the setup menu (press and hold the button for 3 seconds). Toggle the selector button
to the Trigger menu.
Turn the level control up or down to adjust the length of delay time for the trigger output to activate.
Once you have the desired delay time, press the button on the left side of the display to set the time
and return to the operational menu.
TUBE ROLLING
The BHK Preamplifier ships with a matched pair of 12AU7 vacuum tubes that we have hand selected.
As with any vacuum tube based product, the sound of the system depends on the type of tubes in
use. You may wish to experiment with other tubes in a process commonly referred to as tube rolling.
To access the tubes, first remove the AC power cord from the rear of the BHK Preamplifier. DO NOT
ATTEMPT TO ACCESS INSIDE THE PREAMPLIFIER WHILE IT IS CONNECTED TO AC POWER.
THERE ARE LETHAL VOLTAGES INSIDE.
Remove the top cover grille using a small screwdriver. Carefully remove the tubes and replace with the
new ones. Place the top cover back on before powering the unit back up again.
+12v Trigger
Changing Tubes
9