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These GE Military 5Y3WGTB (6087 industrial) are excellent tubes. They truly rival the pricey military Bendix Red Bank 6106 (annoyingly long warm-up) for a fraction of the cost and are also long lasting and tough tubes that hold up very well in demanding studio and road use. These 6087/5Y3WGTBs are also a controlled warm-up tube so they are much kinder to other amplifier tubes and components since they don't slam the other tubes with high voltage before those tubes have warmed up which extends the life of those tubes/components and also makes them an preferred choice for other electronics like Hickok tube testers (e.g. TV-2, -3 and -7 series, among others). Highly recommended.
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Not as strong as the JJ. I bought it for a Princeton w/no stand by to ease on the 6v6's. It does that. Might try re-biasing to see if that makes a diff.
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