Equivalent: ECC83, 7025

Perfect for hifi, very close to old General Electric 12AX7.

Hifi power triode

Construction - Glass. Cooling - Convection. Useage - Intended for use in class A, AB or B audio amplifiers. Features - Uses ulra-pure carbonized nickel plate material and a proprietary oxide coating on the filament. The internal structure is well supported and is aligned with respect to the base pins to avoid internal shorts in equipment designed for horizontal tube mounting. The filament is center-tapped to insure low hum.

Valve used in Mesa Double Rectifier

The best 6550 currently built

Construction - Glass. Cooling - Convection. Useage - Ultra linear audio frequency power amplification service. Features - Superior sonic performance and improved reliability through close manufacturing specification tolerance. Increased peak cathode emission from new cathode materials; stable operation from extended processing and ageing; gold-plated grid; new tri-plate anode; single-piece beam forming electrode.

Equivalent: KT66, 5881

Sold under the Mesa-Boogie brand. The best 6L6 currently built. Made after the late Sylvania 6L6GC/STR387, renowned as being the best 6L6 ever ! Construction - Glass. Cooling - Convection. Useage - Beam-power tetrode intended for high-power audio amplifier service. Features - Design and construction is based on the Sylvania 6L6GC/STR387. Microphony and mechanical/therminal shock reduced by adding thick mica spacers and extra bracing. Increased peak cathode emission from new cathode materials; gold-plated grid; tri-plate anode for superior dissipation; precise grid/screen alignment.

For Hifi

The best EL34 currently built.

Construction - Glass. Cooling - Convection. Useage - Audio frequency power amplification service in either pentode, ultralinear or triode connection and single push/pull parallel applications. Features - Superior sonic performance and improved reliability through improved processing and close manufacturing specification tolerances. Laminated material is used to make the plate which in turn improves heat transfer and gives superior performance under guitar amplifier ´overloaded' conditions.

Equivalent: 6550

The best KT88 currently built Construction - Glass. Cooling - Convection. Useage - Audio frequency power amplification service. Features - Superior sonic performance and improved reliability through high plate dissipation rating, close manufacturing specification tolerances and thorough processing. Gold-plated grid; new tri-plate anode; single-piece beam forming electrode.