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In general, I find Sylvania preamp tubes to be very neutral-sounding. Not overly bright, not too bassy, and so forth. My favorite-sounding Sylvania 12AX7 is the long black plate 12AX7, though those are unfortunately prone to microphonics. Sylvania made two models of short plate tubes in the 1950's--the short grey plate, and the short black plate. Both have early breakup, which is absolutely fantastic. The short black plate has greater clarity than the short grey plate. Both, however, are clearer than the RFT ECC83, which is another 12AX7 sub that is known for early breakup. The Sylvania short black plate 12AX7 has rich bass and nice, chimey highs. It is scooped in the mids. If one is looking for clarity and very early breakup from a 12AX7 in a blackface Fender circuit, this is certainly one of the best tubes available. Since the short black plates are relatively rare, they can be pricey. But they won't be prone to microphonics nearly as much as their long black plate counterpart. In that respect, they are a good value. Magnificent tubes from a bygone era.Read full review
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Best preamp tubes for a clean bluesy sound on yer tube amp! Very bold smooth tone with very little noise and a lot of volume! A+
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These 1950s Military Contract 12AX7s with long black plates are great sounding tubes - not great for high gain applications but in v1 /v2 of a Fender circuit they are awesome. Quiet, punchy and great high end sparkle. I like them just as much as RCAs of the same era....
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Hands down one of the Best I have ever Encountered. Has Tone For Days and Quiet to.
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I like how sounds my amplifier with this tube!
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