- on Miscellaneous Electronics
- Published in issue 3/2016 on page 13
Peculiar Parts, the series
When you think of vacuum tubes, I bet you the first thing you think of is a bulky, heavy audio amplifier with large glowing glass tubes humming away. Those tubes need a lot of power and also use some pretty high voltage but did you know that there is another class of vacuum tubes that are designed to use batteries as a power source? There’s even some tubes that can operate from a 9-V battery!