Hi, How is the bass response with the Bugle SE 45 , the coupling cap in the original schematic ( 0.067uF @ 5Hz ) or even (0.047uF uF @ 7.2Hz ) suggested looks to small , and the -3dB corner frequency with a 3Hz roll off with a 470K load resistor on the grid of the 45 would suggest a 0.11uF...