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I don't think so.

We ran into that problem with that tube back in 1992 when it first showed up in the US.

If I were you, I'd rewire the socket for a 6CG7 or 12BH7, which are essentially a 6SN7 in a miniature format- and are much better sounding tubes.

The 6H30 was designed for instrumentation, and while very linear, is not good for audio due to microphonics and issues of ultrasonic oscillation, just like its brethren, the 6DJ8 and 6922 (both also frame grid triodes).

IME/IMO these tubes always have a touch of brightness about them that is not found in made-for-audio tubes. IMO the microphonics of the tube is somehow able to interact with the signal, creating a bit of IMD, but I have not proven that. At any rate they always seem to have a bit of unnatural iridescence. Its no problem getting similar bandwidths out of audio tubes.

If you really need the extra mu this might be a problem, but in most cases where this tube is useful (line stage, driver tube) you can usually get around it.

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