The NOS Russian 6H30p-DR tube is a fantastic tube for high-end audio.They are typically considered the premium version for the 6H30 tube type (such as 6H30, 6N30 or 6N30P). Our current inventory were produced in 1990. Just like the '70's and 80's era tubes, these have the large halo-style getter ring, not the small disk used by Sovtek, and the bottom mica spacer does not have any written numbers on it.
The 6H30 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.
Please note that this tube can not be used in place of 6DJ8 or 6922 tubes in other pre-amps; it can only be used in equipment that is designed for it.