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 B
Owner’s Reference
©2021 PS Audio Inc. All rights reserved.
®
Owner’s Reference BHK Signature Ampliers
Tube life
Keep a spare set
Place the other
tube in the socket
12 volt trigger
4
Tubes have limited life spans. With normal use of a few hours a day they can go for many years
without replacement. The sonic characteristics of tubes will change over time. At rst, many hours
are needed to sound best as they break in. As time goes on they will perform beautifully and
reach their peak performance. But with extended use, typically a year or two of service, their
performance decreases slightly and the BHK will not sound as it did. This indicates it is time to
change the tubes.
Under normal usage we recommend changing the tubes every one to two years. Replacement
matched pairs are available from PS Audio as well as numerous tube retailers.
It probably makes sense to stock a fresh pair of tubes just in case. While not likely to fail or need
to be replaced often, tubes are the single most vulnerable parts in the BHK Signature Amplier.
For those users wishing to remotely turn on and o the BHK, we provide a trigger input. This input
accepts from 5 to 12 volts. When a positive voltage within limits is applied, the amplier will come
out of standby and turn on. Removing the voltage puts the BHK in standby mode.