Owner's Manual

4826 Sterling Drive, Boulder, CO 80301 Troubleshooting

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

Rev B

Troubleshooting

Owner’s Reference BHK Signature Ampliers

Check to make sure power is going into the BHK and it is connected to a live source. Make sure the

rear panel master power switch is in the on position and the lights near the tubes are lit. Push the

front panel logo light and it should blink, then remain lit after 30 seconds. If it is lit, look to the rear

of the unit and see if the tubes are lit and glowing. If there still is no sound, check the preamplier

and its connections to the BHK. Check the speaker cable connections to the speakers.

If the front panel logo light continues blinking after the rst 30 seconds, there is a fault condition.

Push the button again to reset. Check the fault conditions listed earlier in this manual.

If there is hum coming from your loudspeakers it may be coming from your preamplier, or it

may come from an interaction between components in your system and the BHK. This type of

interaction is known as a ground loop.

The rst step to deteremine where the hum is coming from is to place the BHK in standby and

remove the input connection from the preamplier. Turn the amp back on and see if there is hum.

Chances are good there will not be. If the hum is a low frequency soft sound, see if its level goes

up and down with the preamp volume control. If it does, the problem is in the preamplier. If not, it

may be in your connecting cables. Try a dierent set. If the hum is a sharper buzz it is most likely

a ground loop.

The easiest way to gure out where ground loop problems lie is by the process of elimination. You

need to determine where the hum or buzz is coming from within your system.

If the hum/buzz goes away when you remove the inputs to the power amp, your next step will be

to reconnect the amp and move further down the chain. It is important to do this in the correct

order and take the time to perform the test in a methodical step-by-step manner.

If you have a preamp, or processor that is feeding the power amp, your next step would be

to disconnect all inputs to the preamplier or processor. Once these are disconnected, and the

preamp or processor is connected only to the power amplier, turn the system on and again,

listen for hum. Should the hum now appear, it is a problem with your preamp or processor or their

interaction with the power amp. Before returning the preamp or processor to the manufacturer,

try a cheater plug to break a ground loop. Cheater plugs are simple devices that convert a three

prong AC plug into a two prong AC plug and in the act of converting three prongs, to two prongs,

they disconnect the ground from the wall socket. Try one of these on the preamp, or the power

amp, or both.

If you determine that there is still no hum present when the preamp, processor or receiver is

connected with no inputs, then selectively begin plugging in your various inputs one at a time.

After each connection, check for hum until you discover the humming culprit. Use the same

method described above to remove the ground on the oending piece of kit.

BHK won’t play

music

Check the logo

If you have hum

Ground loops