Anyone use the Electro Harmonix English Muff'n as a valve pre-amp? I'm just wondering if it would be any good giving me a valve pre-amp stage to my solid state amp (Ashdown 300 MAG) so i'd have a valve hybrid on the cheap? Most of the hybrids i've looked at (eg. Orange Tiny Terror or Ashdown ABM) have 1 or 2x12AX7 in and the Muff'n has 2x12AY7 or sometimes 1x12AX7 and 1x12AY7). I've heard good things about the overdrive of the pedal but wondering if it would give me a nice warm valve tone without breaking up? The tubes can be swapped out for more options (eg. 12AY7 swapped for 12AX7). Muff'n's are only £120 vs £400-500 for a valve hybrid head so would kind of make sense if it worked.