Class A tube guitar amps. Everyone’s heard the term. It’s generally associated with higher-end amps in support of an amp maker’s claim that their product sounds “better”. I’ll leave the debate as to which is better to others. What I want to discuss is what Class A really means and, from the pet peeve perspective, to debunk many amp manufacturers’ claims that their products are Class A when clearly they’re not! You may be surprised at how many amp makers falsely claim Class A operation. So, let’s review, in practical terms, what Class A really is and learn a simple rule of thumb you can use to spot operating class BS!