The Steel Guitar Forum

Bill Lawrence still makes and sells the Q Filter. Order it at http://www.wildepickups.com/Q-filter.html.

However, I don't believe it eliminates buzz. It's more of a tone shaper.

I would suggest change your pickups Trutones have got to be the most noisey pickups around ,their tone quality is ok but in my experience they hum and buzz like no tomorrow. They are totally unshielded.
Cheers