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Sovtek 6H30Pi super twin triode. High transconductance, high perfomance tube used in preamplifier and driver circuits.
The Sovtek 6H30pi tube is a fantastic tube for high-end audio. This unusual tube variant (sometimes called the 6H30, 6N30 or 6N30P) was first used in hifi audio by Balanced Audio Technologies. They introduced it to the audiophile world in the 1990's. Now, many other audio designers/manufacturers such as Audio Research and Conrad Johnson, use this wonderful tube in their tube amplifiers and preamps as well.