Ceriatone Overtone Joyful Music JM50 JM100 Amp/Combo

(Unofficially the clone of John Mayer's Two Rock Signature Amplifier)

All head units have the 4 famous and highly sought after mods installed. The 4 mods can be switched on or off. When all mods are off, it's just the stock JM50.

The 4 popular amp mods:

LNFB Switches - The LNFB Switch allows you to turn the local negative feedback on and off for V1, just like the Steel String Singer. With it off, the sounds a bit louder/ raw.

Reverb Treble Bleed Mod - The treble bleed is for the reverb control. Original JM uses a big cap there, making the amp darker, and reverb less lively. The mod is a 3 way, so you can have our value, original, and somewhere in the middle.

FB Mod - As for the NFB, it changes the negative feedback resistance value, so you can have stock, lower FB, and then no NFB as well.. NFB can affect the gain, as well as a bit of frequency response. It will be good to make it a bit more wilder sounding, as opposed to a cleanish, darker amp, as is.

Gain Mod - As for the gain mod, the JM original ckt dumps quite some signal early in the preamp. This mod allows you reduce this dump, making the amp gainier/ louder.

When people talk about “holy grail” guitar tones, there are names that inevitably come to mind for most guitarists.  Brilliant players like Jimi Hendrix, David Gilmour, Angus and Malcolm Young, Eddie Van Halen, James Hetfield, and Robben Ford have changed music as we know it not only with their undeniable skills as writers and players, but also with sonic signature.

One of such brilliant players is John Mayer.

While we have no affiliation with any of these players, their influence in our work can be seen to those attentive.

The Joyful Music! 100 is a clone of the amplifier largely responsible for Mr. Mayer’s amazing tone.  While this won’t get you an amazing collection of Rolexes, or help you date the most beautiful women on the planet…you’ll at least sound good!

Think of the JM50 / JM100 as the mellow, wise brother to the SSS 50 /SSS 100.  While the SSS is all about power, the JM has a similar signature but delivers it more sweetly (and less earth shatteringly loud).  The dynamics are a bit bouncier, more vintage-feeling.  Tonally, the two amps are somewhat similar, but the JM is much cleaner, a little sweeter on the high end, and has a more prominent midrange more similar to other OTS amplifiers.  The JM is also more stripped down in its features (and wiring), which equates to a bit more pure-to-the-guitar tone.

As with all Ceriatone amplifiers, we’ve obsessed over component selection, and it uses our specially designed, custom transformers for superior reliability, frequency response, and feel.