(3 votes, average: 4.67 out of 5)
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Very rare tube and not well known. What adds to confusion is that there is also Western Electric 102A tube – which is completely different. This is special selected type 45 tube that was used on Boonton’s Q meters. Very little information is available about it.
Sound wise, it’s very similar to the sound of regular type 45 tubes – warm, transparent & relaxed. Not as good as Globe type, but one of the best ST types. Definitely worth hunting down.