Quote:
Originally Posted by Puma Cat
The 6H30 (aka known as 6N30, as the actual Cyrillic letter resembles both an "N" and an "H") are a Soviet military avionics tube and are extremely durable. They should be good for at least 10,000 hours or so.
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Another fun fact about the 6h30 is that if you want to do "tube rolling", then avoid a preamp that uses this tube. There are only 2 tubes you can get for this, and my understanding is that they are essentially the same. There's the sovtek version and the electroharmonix. The EH version is the same as the sovtek, except it has gold pins.
Same with the bigger 6550 tube. However there are NOS versions of this tube that are in high demand.
This is why you don't hear many people talking about tube rolling with Audio Research. There's not much you can do.