Woo Audio WA3 Single-ended - Manual (Page 12)

©2011 WOO AUDIO tm Inc. All rights reserved. www.wooaudio.com Rev 1.0. June 10, 2011. 12
FAQ - Frequently Asked Questions
There is abnormal sound right after turning on the amplifier.
This is normal from a cold start as the tubes are warming up to get into the proper
working state. The noise will disappear gradually.
Can I change headphone while the amplifier is on?
Yes, but you must first minimize the volume.
No sound is coming out of the headphone.
o
Check that all tubes are properly installed.
o
Check that the source is properly installed and is working fine.
o
Check that the source switch is on the correct position.
o
Check headphone connection.
There is noticeable noise coming from the headphone.
o
Remove all sources from the amp to check if the noise disappears. If it does, the
noise is coming from the source.
o
Place the amp away from other electronic devices to check whether those were
causing the noise.
o
Place the amp in a different location to check if the noise is coming from the AC
line.
o
Remove all tubes, clean tube pins, and then reinstall them again.
o
Replace some or all tubes.
The sound is abnormal or distorted.
Replace tubes to see if they have deteriorated.
The LED and the tubes do not light.
Check if the fuse is burnt. See the following instruction on how to replace a fuse. The
fuse type is 2 or 3A, slo-blo.


Insert a small flat
screwdriver into
the fuse door
which located on
the AC inlet.
Release the fuse
door by pulling it
out.
The fuse holder is
released from the
AC inlet.
The fuse is held by
a clip
.
