Okay, I first discovered one of these little guys amongst a bunch of 2$ tubes that I bought from an antique shop (half of them tested badly so don't get to jealous ). But any way I'm currently trying to build a vacuum tube based synthesizer, and I did get it to mix two different signals alright, so I decided to buy more of them.
My question is, is there really any way to use pentagrids with audio? I'll take any and all suggestions, even if they're not synthesizer based, I feel like these tubes would prove quite interesting in projects to come.