Tips: About the maintenance of tube speaker maintenance
How do you get the best performance from your tube guitar speaker and let it produce the best sound?
No equipment can defeat the fat and crisp, compressed and sustaining sounds of the box. This incandescent-based circuit has become an artifact of rock and blues guitarists since the early days of electric guitars.
The technology based on these circuits can be traced back to the middle of the last century. Unlike the circuit of transistors, the "temper" of the tube is a bit moody. Understand some common sense, and then do some precautions that will allow your head to perform at its best and maintain minimal work.
Most of the tube heads have a standby "standby" switch that allows the tube to operate in a low-voltage current when you are not playing the piano. When you start to increase the volume, the preheat-sensitive tube component has warmed to a temperature that is working properly, which extends the life of the tube. It's a habit to put the Standy on the box for a few minutes before you start to increase the volume.
The filaments and poles of the front and rear tubes of the box head are very fragile and cannot withstand large collisions. Barbaric handling can also loosen the socket of the tube and cause instability. When you mention the box head, you should imagine it as an antique, very precious instrument, and be sure to take it lightly. It is the most dangerous time to carry the equipment in the show, especially if you need to tour the band manager or volunteers.
Although it is possible to extend the life of the tube by gently handling the head of the box, life like this is sometimes not guaranteed. Sometimes the new tube will suddenly be inexplicably broken, and the old one has been used for decades, especially for the tube in the front of the box.
An old saying goes, "If you don't have something bad, don't fix it." This applies especially to the tube of the guitar case. However, the tube may not be accidentally broken one day, but it suddenly breaks. If you find that the sound of your speakers doesn't sound the same as before, feel that the total volume of the speakers doesn't feel loud before, or you need to screw up the gain (GAIN) and volume (VOLUME) knobs to get the usual volume. Then it is very likely that the pipe is aging.
If you often play at high volume, you may need to change it every year. If you only use the case occasionally, you don't have to change it as often. If the speaker sometimes hums or hums, it is likely to mean that a tube is broken, and the aging tube will also cause high frequency chatter or howling, when you turn the volume down, this noise Still won't disappear.
Choosing the right tube It is generally recommended to replace the tube as recommended by the box manufacturer. There are some box head manufacturers, such as "Randall", which have a bias (Bias) control that allows the user to choose to replace different types of tubes. But if your box doesn't have features like bias control, then you plan to replace the EL34 with a 6L6 tube. We recommend that you check out the experience for more information about your box head.
We lack advanced testing equipment, but by visually observing the working tubes, you can get an idea of ​​whether your speakers are correct for Bias. If the tube emits a soft amber or orange glow, this means that the tube's current is roughly normal (correctly Bias). Conversely, if the tube emits a purple or blue glow, it is likely that there is no correct Bias (undercurrent)
Some tube manufacturers, such as "Groove Tubes" and "Rudy", usually provide matching tubes that have been tested and then selected for various electrical properties. Because the back or front of the box is not used. Matching tubes will make the sound perform poorly, and this matching tube is worth a little more money.
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