Dual gate mosfets were a godsend when building RF/IF mixers or preamps. Luckily I have a small stash as they're almost unobtanium and costly these days, but for most uses such as mixers and preamps they can be swapped with a pair or normal jfets in a cascode configuration like this one: https://i.stack.imgur.com/6Nyhg.gif

Today I learned you can build an entire freaking CPU out of 555s lol

https://hackaday.com/2011/08/05/building-a-computer-out-of-5...

> Dual gate mosfets were a godsend when building RF/IF mixers or preamps.

exactly :)

BF901 FTW.