Owner's Manual

4826 Sterling Drive, Boulder, CO 80301 Owner’s Reference

PH: 720.406.8946 support@psaudio.com www.psaudio.com 15-070-01-1

Rev Bƒ

Owner’s Reference

Owner’s Reference BHK Signature Ampliers

The BHK Signature ships with a hand matched pair of vacuum tubes pre-installed in the unit.

There is no need to install tubes, simply set the amplier up and you are ready to play it.

There are many who will wish to experiment with dierent tubes on the BHK input in a practice

known as tube rolling. The BHK will accept and work with most 6 or 7 series dual triode tubes.

Dierent tubes require dierent bias currents, but the BHK will automatically adjust the current to

exactly what is needed.

To replace tubes in the BHK, follow these steps:

• Turn o the main AC power either by unplugging the power cord from the AC source or turning

o the main power switch on the rear panel.

• Remove the rear tube cover by loosening the two screws and remove the tubes currently

installed.

• Wait for LED to go out.

• Place the tubes in the sockets making certain the orientation of the pins is correct. There is an

obvious break in the circular array of pins that matches the socket they are going into. Refer

to the pictures below.

Tubes are shipped

already installed

Tube rolling

How to change

tubes

Remove the

tube cover

using Phillips

screwdriver