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In Reply to: RE: Any approach we can make 6h30 warmer and richer? posted by Eric Chan on January 30, 2017 at 03:44:02
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.
Follow Ups:
Finally, someone has alluded to it. Perhaps, just perhaps, the 6H30 is not capable of the desired sonics. I have read countless posts and opinions about this tube - even technically well-implemented, I doubt I could ever love it.Like any tube, its sound can be mitigated (obscured?) by judicious component selection. Although acceptable presentation may be achievable in this manner, I don't believe musical greatness is achieved by trying to balance sonic extremes.
Cheers,
91.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
Edits: 02/01/17
If its audio characteristics had these inherent flaws? I've never heard a unit that used the 6N30P. Only heard a couple Aikido that used 6N30P-DR tubes. They sounded pretty good to me. Maybe, the -DR versus plain 6N30P is a big difference?
I'd convert the unit to used the 6CG7, if the 6N30P has all these ultrasonic and IMD issues.
I'm not saying the 6H30 is flawed, more that I doubt I'd like its sonic signature. Preferences are personal and varied; there are plenty of components I might like to listen through and plenty I don't.The DR version would probably be more to my liking - if I had to use the 6H30 that is what I'd be paying for. Still, if I were designing a component from scratch for personal use that needed a ~mu 20 tube, I'd be using something different.
Cheers,
91.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
Edits: 02/01/17
> > If I were you, I'd rewire the socket for a 6CG7 or 12BH7,
Using single stage of 12BH7 or 6SN7 does not give you the output impedance low enough to drive the power amp
Also, but how would CJ , ARC also make use of 6h30 for thier high wnd preamp model if the HF osc is that bad?
Using single stage of 12BH7 or 6SN7 does not give you the output impedance low enough to drive the power ampThis statement is outright just plain false. These tubes have been used as driver tubes in amplifiers for decades, and would work easily at the output of a preamp- and would be rather gutsy in that regard.
Also, but how would CJ , ARC also make use of 6h30 for thier high wnd preamp model if the HF osc is that bad?
That's a loaded question, but the short answer is apparently (IMO) 'not that well' (again, just my opinion; I don't think its all that hard to find better sounding preamps). One would hope that their gear lacks any HF oscillation tendencies! My impression personally is that microphonics (not oscillation) is really the big issue. I've seen some of these tubes that were so bad that you could yell at them and hear yourself in the loudspeaker. Its really hard to build an audio circuit that sounds right when the tube won't behave.
Edits: 02/01/17 02/01/17
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