The Black Panel Fender Pro Reverb has skyrocketed in popularity over the years, though it took a while to get there. Considered "too weak" for the mid-1960s market, today they're beloved for their signature Black Panel sound and breakup at much more manageable volumes than a Twin Reverb or the piggyback amps. Standing in at 40 watts with two 12" speakers, the Pro Reverb is essentially a dialed-back Twin -- smaller transformers, half the power tubes and a tube rectifier produce a saggier sound that drives much earlier. This fantastic stage amp has seen a renaissance over the last couple decades and has become a wildly popular stage amp for bands touring mid-sized clubs.