The 300B Electro Harmonix Gold Matched Pair are THE premium 300B valve. This is the premium version of the 300B EH with gold grid wire for increased bias stability as well as top of the line sonics and performance.
The 300B was introduced to the market in 1938, so it must be good as it is still in production today !
Ultra-long life, high-quality construction and superior sonics with improved performance make it a top choice over 300B types made by other manufacturers. Like the original Western Electric 300B, it has the eight course, directly heated filament, 40 Watt plate dissipation, classic large-shoulder tube glass, and is available singly or in precision matched pairs. The 300B EH’s plate curves and static DC characteristics (plate resistance, transconductance, mu) also exactly match the original’s for superior performance in any vintage or modern 300B amplifier.
The valves are accurately factory matched . The factory tests for the mutual conductance and the current and these are attached to the top of each valve box. The test conditions are printed on the bottom of each valve box and you can see these in the picture.
These are made with real care and is the perfect choice for replacing tor upgrading your quality hifi amp
There is a 120 day warranty on all valves that we sell. The units will be shipped special delivery to ensure these valuable units reach you fast and in perfect condition