hey guys, i've got a 2010 BK Butler with Bias knob. was never happy with the 12AX7 that was in it. So i reached out the BK Butlter about a new tube they say is specifically tailor made for the pedal. they offer a New Stock NOS 12AX7 and 12AU7 for $69. most tube dealers sell these for $15 - $44. do you guys think theirs is made better some how ?