Custom Grand John Mayer JM50 Overtone Two-Rock Signature Amplifier 50 Watts 230V 120V Product No.:JM-50b Online Inquiry Details Custom Grand John Mayer JM50 Overtone Two-Rock Signature Amplifier 50 Watts 230V 120V Previous Product:Custom Marshall JMP Style 2061 Lead & Bass 2-Channel 20-Watt Guitar / Bass Amp Head 1967 - 1974 Next Product:Custom 2023 Grand Princeton Reverb Amp Guitar Amplifier Head FD Clone Sprague Orange D caps preamp 12AX7 *3 Reverb 12AT7 Power Tubes 6V6GT *2 accept guitar, bass, amp, pedal, OEM Related Products 5E3 Fender Style Hand Wired Amp Chassis Custom Grand HIWATT Replica HW DR504 Custom 50 Watt Guitar Amplifier Head JJ Tubes 12AX7*3, 12AT7*1, EL34*2 Custom Grand 1959 Plexi 50W 1968 JTM45 JCM800 Point to Point Hand-wired Guitar Amplifier Head EC83*3+EL34*2 Accept Amp OEM