- on Miscellaneous Electronics
- Published in issue 1/2017 on page 7
The Fetron, a Solid-state Tube
Peculiar Parts, the series
It’s shiny and tubular, 25 mm tall and 15 mm in diameter, with seven gold-plated pins at one end. It’s clearly an active device but is it hollow-state or solid-state? The answer is both: it’s a tube and it’s solid-state, because it’s a Fetron.