Glenn uses for his home studio in England (and primary practice amp) the generation 1: Crate Blue Voodoo BV 120H all tube, all American head with the blue tolex (not the black or red tolex of later generations). This amp is seen in several of his demonstration videos and guitar collection tour videos online and caused a run on this amp by fans forcing the prices to rise rapidly in the used market for shrinking supply of the amp (due to its age and limited production run) ...this phenomenon is not unlike the fan run situation on the small marshall amps (5005) used by Billy Gibbons of ZZ Top.