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The vacuum tube has an honored place in the audio timeline. It preceded stereo, the LP, and of course everything digital. When tubes gave way to the solid-state transistor, consumer electronics began its steady march toward lighter weight, lower cost, reduced heat dissipation, and greater energy efficiency. Entire new product categories were born—such as the portable transistor radio, the distant forebear of today’s smartphones and iPods. Solid-state technology further democratized audio in the 1970s as Japan exported mass-market stereo receivers to music lovers on a budget. By the time home theater and surround sound got underway, tubes had long since been left behind by the mainstream. One by one, all the tubes winked out. Or did they?

This is a fascinating hybrid of a product: a portable projector with built-in, Roku-powered, media streaming.

There are web streamers, and there are projectors, but this is the first time I've seen them combined into one, easy-to-use product.

Fascinating is one thing. Worthwhile? That's a different question. . .

Class D amplification has a narcotic-like hold on the audio electronics industry. These switching-mode designs mesmerize with a dazzling array of advantages: high efficiency, high power output, low weight, compact dimensions, and depending on implementation, enormous cost savings.

Hot on the heels of Apple’s latest iPad (and lukewarm on the heels of Amazon’s new Kindle Fires), Google announced new Nexus tablets in unsurprising sizes and price points.

As I’ve said before, hardware is largely irrelevant to the tablet market. Greater resolution or processing speed doesn’t help you get more content to download.

To that end, Google announced new licensing deals to bring more content to Play — and I have a chart to prove it.