This is one of #YorkPa's largest - and best known - ghost signs. That size contributes to its popularity, as does the fact it's along one of the city's most-traveled roads, Roosevelt Avenue. It's on ...

Raytheon is best known as a major defense contractor, but the company’s roots go far deeper, starting as a major manufacturer of vacuum tubes in the early days of radio. Today, the company is mostly ...

Vacuum tubes disappeared from electronic products years ago. Yet there have been some lingering vacuum tube-based products in production. Vacuum tubes disappeared from electronic products years ago.

Before transistors or microchips, the earliest computers relied on vacuum tubes — glass bulbs that glowed like small light ...