My amp is making strange noises (fizzy crackling sounds or popping noises)? How do I get it fixed? You probably need to change your tubes if your amplifier makes strange noises (hisses or squeals) or if it experiences a lack of power or a lack of bottom end. How do I know if I need to change my tubes? If the tonal characteristics of a Class A are desired, an A/B amp can be carefully designed to do that (the Soldano Astroverb is a good example of such a design). The amp will run more efficiently with more power and you’ll enjoy not having to replace power tubes as often. Just for tube life alone, I believe Class A/B is the way to design any amp. Operating in Class A, the maximum power we could expect would be around 20 watts, while operating in Class A/B would easily yield 50 watts. An example would be an amplifier with two 6L6s in the power section. For the same given tube compliment, Class A/B will produce two-to-three times as much power as Class A. Tubes in a Class A amp tend to run hotter, as well. The Class A amp sounds more vintage and squishy, because it’s compressing and distorting more. However, in short, the differences can be summarized as follows:Ĭlass A/B amps tend to have greater dynamics, sound punchier, tighter, cleaner, and have cooler running tubes. To properly explain the technical differences between these classes of operation would require a lengthy discussion. Class A and Class A/B are terms that describe how the power tubes work within the power section of a guitar amplifier.
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