AMT F1 - JFET guitar preamp (1 channel) Fender Twin (+ power supply 12V with EU plug included!),AMT Electronics: F1 (review and demo),AMT F1 - JFET guitar preamp (1 channel) Fender Twin (+ power supply 12V with EU plug included!),AMT F1 - JFET guitar preamp (1 channel) Fender Twin (+ power supply 12V with EU plug included!),AMT F1 - JFET guitar preamp (1 channel) Fender Twin (+ power supply 12V with EU plug included!)