Features 4x 12AX7 4x EL84 GZ34 recitfied. The preamp sections of the AC20/40 with volume, bright switch, bass cut switch combined with the high gain side of the 30/800 - Bass, Treble, volume, gain. Global Cut control that removes high frequencies from the power section. This is a dual input amplifier that allows the user to access either channel or both with an additional A/B/Y pedal (not supplied) the best of chimey class A cleans and high gain crunch in one amp. Hand built by Joe Morgan with custom modified boards and chassis that all bear his signature. Description Product Description The preamp sections of the AC20/40 with volume, bright switch, bass cut switch combined with the high gain side of the 30/800 - Bass, Treble, volume, gain. Global Cut control that removes high frequencies from the power section. This is a dual input amplifier that allows the user to access either channel or both with an additional A/B/Y pedal (not supplied) the best of chimey class A cleans and high gain crunch in one amp. 4x 12AX7 4x EL84 GZ34 recitfied. Hand built by Joe Morgan with custom modified boards and chassis that all bear his signature.