Even if you aren’t a tube aficionado, you can’t help but be mesmerized by the blue glow inside a mercury vapor rectifier when it operates. It looks less like early 20th century tech and more like ...

John Dunn recalls a close call with at at-home vacuum tube experiment and shudders at the thought of using another particular ...

Converting ac to dc has been accomplished by several different types of rectifiers through the years. Here are a few of the more common types of rectifiers used in the past 100 years. Mercury arc ...

Single-ended tube with a brass admedium base insulated skirt and two glass insulators. Tipless T-shaped envelope. 1 amp rating. Donor’s card reads: “Tungar rectifier bulb made by the General Electric ...

Single-ended tube with a brass admedium base insulated skirt and two glass insulators, a contact post extending from the skirt and around the bulb to the top. Tipless P-shaped envelope. 2 amp rating.