Woo Audio WA5 300B Single-ended Triode - Manual (Page 12)

©2011 WOO AUDIO tm Inc. All rights reserved. www.wooaudio.com Rev 1.0. June 27, 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 all tubes are properly installed.
o
Check source is properly installed and it is working fine.
o
Check 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 comes from the source.
o
Test the amp away from other electronic devices which can introduce noise.
o
Test the amp in a different location to check if the noise comes from the AC line.
o
Remove all tubes, clean tube pins, then reinstall them again.
o
Replace some or all tubes.
There is a constant low frequency hum coming from the headphone.
You can adjust the noise adjustment attenuator which is located under each handle on
the AMP unit. The left attenuator is for the left channel, and right is for the right
channel.
The sound is abnormal or distorted.
Replace tubes to see if they are deteriorated.