Description

All tubes have been tested on a Maxi-Preamp 2 machine under the respective settings for each type. The transconductance (gm), in uA/V or umho units, and gain (u) of each triode is written on each box as well as a brief description. Pairs etc. are matched such that transconductance and gain are within 5% and brand/construction is the same. Type: 12AT7/6201 Brand: General Electric Description: Short plate, three mica, five star