If the tubes are still within their six-month warranty period, we will happily send you a replacement for any non-functioning or bad tube found at no charge. You'll probably be successful with much less effort than is required to disconnect everything and haul the unit to a technician who will basically perform the same simple tests. You will be doing yourself and us a big favor by trying some tube troubleshooting. If you think you've located a problem tube but aren't sure, we recommend substituting the suspect with a new one just to be sure of your diagnoses. Whenever you are trying to diagnose a suspect tube, keep your other hand on the Power and Standby switches ready to shut them off instantly in the unlikely case you provoke a major short. You may notice a slight background hum, however, as the push-pull becomes unbalanced. It will cause no damage to run the amp briefly with one power tube missing. To confirm a noisy power tube, merely put the amplifier on STANDBY, remove it from its socket and turn it back on. If crackling or hissing changes with the tapping, you have probably found the problem. The power tubes should be all but quiet when they are tapped. Hearing some noise through your speakers while tapping on preamp tubes is normal though and the one nearer the input will usually always sound louder, as it is most often the first tube in the signal path and everything positioned after is further amplifying its output. Occasionally, the noisy culprit can be identified by lightly tapping on the glass of the tube (you may hear the noise change). Tube noise is often caused by contamination within in a tube. Tubes can be easily removed by gently rocking them back and forth as you pull them away from their sockets. The glass around the bulbous silver tip is usually not as hot and may be easier to handle.
Use caution and common sense when touching the tubes after the amplifier has been on as they can get extremely hot! If they are hot and you don't want to wait for them to cool off, try grasping them with a thick glove or cloth. It also helps to have adequate lighting, as you will need to see the tube sockets clearly to swap tubes. by simply swapping out a pre-amp or power tube!įirst, may we suggest that you set the amplifier up on something so that you can get to the tubes comfortably without having to bend down. Much like changing a light bulb, you don't need a technician to cure these types of minor user serviceable annoyances and in fact, you'll be amazed at how easy it is to cure tube problems. Certainly no cause for alarm, this quirky behavior comes with the territory and the Tone. You may occasionally experience some form of tube noise or microphonics. A large percentage of problems we deal with here at Boogie turn out to be tube related. Knowing the following tips, having spare tubes to work with and a few minutes of time will allow you to troubleshoot and resolve most any tube related issue you encounter with a tube amplifier.
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