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Bendix 6106 Rectifier
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Author Archives: tubemaze
RCA 6F8G Smoked Glass
GE 5-Star 6386 Black Plates
GE 5-Star 6386 Black Plates Triple Mica
Philips ECC40 Wrinkled Glass 1956
GE Five-Star Brand tubes
Overview of the General Electric Five-Star Series
This entry continues our exploration of legendary vacuum tube manufacturers, focusing specifically on the General Electric (GE) Five-Star line.
Unlike many premium labels that simply “select” high-performing units from standard production runs, the Five-Star brand was engineered from the ground up for high-reliability environments. This distinction was a direct response to the rigorous demands of the aviation industry, where standard tubes proved insufficient for aeronautical safety. Launched in 1951, the Five-Star series represents one of the earliest dedicated high-reliability programs in the industry, eventually incorporating military JAN (Joint Army-Navy) specifications.
Continue readingSylvania Gold Brand tubes
The Sylvania Gold Brand series has attained a distinguished reputation within the audiophile community. This analysis explores the technical specifications and historical context that define the superior performance of these vacuum tubes.
Continue readingSylvania Gold Brand GB-5814A/12au7 Long Gray Plates
What is a Foil Getter?
There are so many great tubes with what’s called Foil Getter. But what is it? How does it look?
Continue readingTung-Sol 7189/EL84M Russia
In 1959 Tung-Sol developed a premium, up-rated version of the 6BQ5/EL84 for use in industrial and military circuits. This tube was designated 7189. Due to its higher plate voltage rating and increased clean headroom, it became a favorite power tube for use in medium power stereo amplifiers and receivers made by H. H. Scott, Sherwood, Fisher, Lafayette, and many other hi-fi manufacturers. It was also used in high-end guitar amplifiers manufactured by Magnatone. Due to its increased ratings, it was considered as an upgrade for 6BQ5/EL84 amplifiers for increased performance and reliability.
The original 7189 tube production ceased in the early 1980s and vintage 7189 tubes have become expensive and hard to find. In order to allow these fine vintage 7189 amplifiers and receivers to continue be used, the Tung-Sol 7189 tube has been reissued. The 7189 Tung-Sol® reissue is built to the same specifications as the original 7189 Tung-Sol for the high fidelity and performance expected from the vintage 7189 amplifiers and receivers produced in the 1960s and 1970s.
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