Friedman IR-D Dual Tube Preamp PedalFRIEDMAN IR D Dual Tube Preamp & DI Simple All Tube Direct Solution All Tube Preamp, IR Technology, Compact Size The Friedman IR D dual channel tube preamp is an entire Friedman rig in a compact pedalboard friendly package. IR D boasts two fully independent identical foot switchable channels which are based on Friedmans legendary Dirty Shirley Twin Sister designs. This Dave modded JTM45 circuit delivers the signature British tone for which Friedman is