I just got my Weber Bias Rite BR-2 and decided to bias my DRRI. I hooked up the factory GT power tubes (just to test my biasing skills) and was shocked by the readings. One of the tubes was drawing 19 mA (which was about as anticipated) but the other one was drawing 40 mA! Is this even possible? I would think something would sound "off" with that great of a disparity in current draw between the two tubes. Next, I plugged in my Tung Sol RI 6v6GTs and they were matched perfectly (thanks to Mike @ KCA NOS tubes). The bias actually didn't need much adjustment; it only needed to be a touch hotter.