The Electro Harmonix Matched 300B stands out for its ultra-longevity, high-quality build, and exceptional sound, offering improved performance that surpasses other 300B variants from different manufacturers. Mirroring the iconic Western Electric 300B, it features an eight-course, directly heated filament, a 40-watt plate dissipation, and the classic large-shoulder tube glass.

Available individually or in precision-matched pairs, the 300B EH ensures that its plate curves and static DC characteristics—plate resistance, transconductance, and mu—precisely align with the original for unparalleled performance in both vintage and modern 300B amplifiers.