Ruby 12AX7AC5 HG+
The Ruby 12AX7AC5 High Grade tube is the Shuguang 12AX7 9th gen tube, but distributed by Magic Parts. These are a very consistently made tube, sweet sounding, and very warm. "High grade +" is one of the labels in the measuring system used by Magic Parts. It basically means the tube is best suited for the most sensitive first gain V1 spots.