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Rectifier Tubes
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When it comes to your sound, this means that the effect of changing rectifier tubes is a bit more nuanced than it is with the other two types. The characteristics of power and preamp tubes actually change—in some cases, significantly—at different voltages. As a result, your choice between a 350-volt and a 400-volt rectifier tube, for example, will actually alter the performance of the other tubes. Another important characteristic of rectifier tubes is that they have their own internal impedance, which reins in their voltage briefly when a load is first put on them. When you play, that sounds creates a sagging effect on the attack of a note, followed up by a swell of volume as the tube kicks its output back up. This effect gives an amp with rectifier tubes a unique quality almost like a built-in compression effect, softening your lead-in and boosting the rest of the note. Different rectifier tubes will express this effect differently, so it's a good idea to read up on what other guitarists have to say about each tube to find out how the ones you're considering will sound. The most popular rectifier tubes for medium to large amplifiers tend to be the GZ34 type, which are liked for their build quality, efficiency and strong power levels. The 5Y3, on the other hand, shines in amps smaller than 15 watts. Any of these classic tubes is a solid choice for any amp that it fits, whether it's a genuine vintage head or a modern boutique combo amp.
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