Gretsch created the Filtertron around the same time that Gibson created their original humbucker. My '58 Gretsch Anniversary has a single pickup, but its a Filtertron stamped PAF which is cool. TV Jones started making a recreation of the Filtertron sometime in the late 90s or early 2000's, after Gretsch was long gone. When they revived the Gretsch brand in the early 2000's, most people preferred TV Jones version to Gretsch's own. In fact, most of the top of the line Gretsches still come with the TV Jones version installed - including all 3 of mine, though then Billy-Bo has the higher output Powertron version. I posted audio clips from the TV Jones site up thread a day or two ago. They keep the bite and twanginess of a single coil, but still have the warmth of a humbucker. He offers several versions of it now, with multiple mounting configurations. The TV Classic is where its at, thats the original great Gretsch sound. Everything I do and try, I always end up back at them. I put a set in my V and think I created a perfect guitar. Plays like a Gibson, sounds like a Gretsch. Edit - I also said this upthread, but they are a very popular choice for Telecasters because the provide plenty of twang. BTW, I met Tom V Jones, the man who makes them, at NAMM one year. Very nice guy.