My tech added a pot using Torre's book to make bias adjustable in my real 59. Unfortunately the values weren't well chosen, and until I get some time with a soldering iron the idle current is just too high with the 5AR4 rectifier (470v @ 52 mA). Using the 5U4GB drops voltage to 450v and current draw to 44 mA but I can't remember if there's a problem with current draw in the rectifier tube. Is this OK? I'm planning to add a 10k resistor in series with the 10k pot which should allow me to adjust down from the above slightly too hot values...