The triode vacuum tube might be nearly obsolete today, but it was a technology critical to making radio practical over 100 years ago. [Kathy] has put together a video that tells the story and explains ...

True audiophiles know that when it comes to serious fidelity, there's no beating the triode tube. And now Hammacher Schlemmer is releasing its own triode-based speakers just for the iPod. Nevermind ...

We see quite a bit of work where people decapsulate ICs or other solid state devices to expose their inner workings. But how about hollow state? [Tomtektest] had a dual triode that has lost its vacuum ...

Design analysis of the K2-W Vacuum Tube Op Amp’s design and operation reveals the mad science that created a commercial revolution in 1950s and 1960s analog computing. Op amps played a critical role ...

The circuit was designed to create a line preamplifier by acquiring the use of double triode tubes. The circuit comprises of three parts, the main preamplifier circuit with tubes, the input selector ...

Why you can trust What Hi-Fi? Our expert team reviews products in dedicated test rooms, to help you make the best choice for your budget. Find out more about how we test. Italian manufacturer Unison ...

Western Electric type 216A high-vacuum triode with tube socket (1922) and a socket. A triode amplifier - oscillator. A 4-pin base with tipped G-shaped envelope. Marked: "Western Electric / Made in U.S ...

A 250 watt transmitting triode with 4-pin metal base, red fiber insulator, tipped T-shaped envelope. Marked: "Western Electric / Made in U.S.A. / 212 D / Patent / 1209324 RE-14572 1303579 1307510 ...