Post
by fiveightandten » Sun Jan 01, 2006 3:23 pm
You don't <i>have</i> to remove the metal covers to do the tap test. But if you want to take the tubes out, you need to take them off...of course.
If you hit a bad one, you'll know it, weather or not the tube shield is on it. Heck, you'll probably be able to hear it just tapping on the chassis, or the faceplate of the amp, if the volume is up.
Don't forget, you do need the amp to be on, and the volume up a little (not too loud!), or you won't hear anything. You'll know it when you hit a bad one. you'll get high pitched ringing, and possibly pops or crackles.
But that being said, hum can come come a lot of different sources...and it may not be a bad tube.
-Nick
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