Tubes in Hi-End Preamps


I’m confused. If some of you engineer types could pipe in on this subject, it would be greatly appreciated. I know a little, but not a lot about electricity. I’ve been in the battery industry for 20 years and have taken two semesters of college electronics, so I know just enough to be dangerous.

For 15 years, I’ve been sans preamp. The idea being that I don’t want anything messing up the source signal. That limits me to one source only though, and I’ve finally caved in to the need to be able to access multiple sources with the turn of a knob.

It’ll be nice to finally have hifi sound when I watch DVDs, and I would like to spin vinyl again after 20 years away from analog. To that end, I have an Audio Illusions Modulus 3A unit on its way now.

OK, here’s my question:

Why is it that many higher end preamps, Audio Research for example, that are said to be “neutral” and “transparent” sounding use tubes in their designs? Wouldn’t it be a lot easier and less expensive to build a solid state circuit that produces clean, neutral, and transparent sound? Aren’t tubes supposed to “color” the sound?

I've noticed the presence of a lot more equipment out there (the latest generation of some designs) with tube output sections that are described as not sounding "tubey." What's the point then of having tubes?

I hope I haven’t opened a can of worms here.
blumusician

Showing 1 response by atmasphere

Here's an answer for the tube question:

Our ears have evolved a certain way over literally millions of years. We cannot change that. Tubes and transistors have distortions that are unique to those devices. It just so happens that tubes have distortions that are innocuous to the human ear, IOW they more closely observe the rules that the ear has evolved to. Transistors are less observant of those same rules and so while they have less *measurable* distortion, the distortions that they do have are far more irritating and audible than those of tubes.

In short, if we can reduce the distortions that tubes have then we will be really getting somewhere. Fortunately that is happening in the world of high end audio.