(4 votes, average: 4.00 out of 5)
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Tube Maze
Guides and reviews of vacuum tubes and tube equipment
A fantastic sounding tube that’s almost impossible to find. This one was was created by Mullard’s Mitcham factory in 1958. It has regular Mullard’s plates with 3 holes, I guess they tried this configuration on their military tubes before using them in civilian tubes later on. Getter is unlike any other that I’ve seen, it’s a D getter, but it’s bent up at the end. Sound wise, this tube is superbly smooth – really stands out of the other 12at7 tubes. Marking B309 was used by Mullard and other british manufacturers to indicate a special quality tube, and special it is. Fantastic tube and I would recommend it, but what’s the point if it’s not possible to find.