In this video I demonstrate S.I.R. #34 mod on my 1983 Marshall JCM800 model 4010 (Combo version of 2204). The mod has been been installed by Daniel Forsberg and it sounds amazing. The #34 mod was used by Slash on Use Your Illusion for instance (he had a 2203 though). I'm playing it through a 1971 Marshall 1960A 4x12 Cab using a 2013 Gibson SG SC Aged with a DiMarzio Norton in the bridge and a 2008 Gibson Les Paul R9 with a Seymour Duncan Alnico 2 Pro in the bridge. The #34 mod was designed by Frank Levi.