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Sylvania Gold Brand 6201 - Gold pins. In a tube FAQ on a popular website some folks consider this to be the cat's meow. It has a legendary reputation for balance and clarity, and very very scarce. We were fortunate enough to get some that were purchased by the British Military. They are in original box (In fact we have the original shipping containers) and even have the military parts number stickers on the boxes.
We're just about out of these, and the stock we have available are only Driver/Buffer Grade. This grade is NOT suitable for preamplifier or phonostage circuits.
Driver/Buffer grade - Lowest noise but not the lowest in microphony. Triode balance will be similar to Gold grade.
This grade is only suitable for use in the driver stage of an amplifier, or the output/buffer stage of a DAC or CD Player.