1) Two Rock John Mayer Signature
The original John Mayer Signature amp, prices have increased dramatically. The original is voiced quite dark, as it was designed to compliment his other brighter amps, such as the Dumble Steel String Singer.
2) Two Rock Crystal/Traditional Clean
After the partnership between John Mayer and Two Rock came to and end, Two Rock release a similar design first as the Crystal and then the Traditional Clean. These are brighter than the original, designed to function more as a stand alone amp.
3) Amplified Nation Dirty Wonderland/Wonderland Overdrive
The Dirty Wonderland takes the John Mayer design, and adds switches that allow more break up if desired. The Wonderland Overdrive simplifies the reverb circuit, allowing tubes to be used for an added overdrive circuit. The early models are hand wired, but since V4, they have used a PCB for the main circuit, with individually wired pots and tube sockets.
4) Ceriatone JM50/JM100
Ceriatone are known for cloning many vintage and Dumble style amplifiers. The Joyful Music or JM50 and 100 are their take on the John Mayer circuit. They offer several mods to add more gain, or take the circuit closer to the Steel String Singer.
5) Sinewave Continuum
Chad from Sinewave, is a former Two Rock designer. The continuum is his take on the John Mayer circuit.
6) PRS J-Mod 100
While and entirely new design, the PRS J-Mod 100 was still designed in collaboration with John Mayer, so couldn’t be left off this list.
7) Grand Amps JM50
Affordable clone out of China. Available from various far east wholesale websites.
