Carl Martin were doing boutique pedals before it was cool... typical Scandinavian smartarses. This is a genuine spring tank, in a big ol' pedal box. A real spring is always going to make for a more authentic wobble than a chip. Plus, this has a sensible set of appointments: remote inputs, two sets of controls, standard 9v negative power... thanks Carl, you done great. 

Model: Carl Martin Head Room 
Made in: Denmark, 2011 (serial 2011230129)
Type: reverb, real spring 
Power: standard 9v negative supply (not included)
Equivalent new street price (approx): n/a
Mods: none
Accessories: no box or manual
Condition notes: used, no major marks, fully functional. Overall: very good condition