John Mayer uses Two Rock amps which are based on Dumble circuits, as is the Ceriatone OTS. I may be generalizing here, but what folks look for from this type of amp is the nice fat, warm, overdrive sound made popular by players like Larry Carlton (think old Steely Dan records) and Robben Ford. Not too crunchy, but sort of violin-like and singy, if that makes sense.

If that sound appeals to you, the OTS is a geat amp. Personally, I live there. It's not, however, a modern rock/metal tone at all.

Yeah i definitely understand it's not a modern rock amp, because a modern rock amp i already have and its not doing what i want it to do. I rarely ever use anything over a bluesy overdrive so my Mesa really isnt getting the use it really deserves.

Im thinking the Overtone is definitely something i should invest in here pretty soon, it sounds like what im looking for. How much did you all spend on yours including shipping?

Awesome man, I was thinkin of going with a Plexi as well. Im leaning more towards the OT though, it sounds like it would be a great amp for what im lookin to do. I want something that sounds good at bedroom volumes and has a great bluesy tone but can also be loud enough if i wanna do a gig at a club or bar or something along the lines of that. Good tone is where its at though, if it sounds good at bedroom levels and even better during a gig then I'm sold.

Ugh gotta hate unexpected expenditures when youre trying to save up for something. What mods are you thinking for the OTS for a closer Mayer tone??

As for a tone i like best im definitely gonna have to go with Continuum. Heavier Things was a great album but i think the effects he used kinda put a blanket over his tone. The tone on Slow Dancing and Im Gonna Find Another You is exactly what im looking for. His tone on Belief and Bold as Love is nice too.

If only someone built a clone of a Two Rock, or Dumble Steel String Slinger..

Nik you listening??

(j/k btw I know Nik is extremely busy these days!!)

I'm a huge John Mayer's tone too and I have a Overtone (I purchased the Overtone with the hope to approach his tone)

First time I plugged my Overtone I was impressed the clean channel is great (very fenderish) etc but past the excitement of a new gear I have to admit that the Overtone doesn't do the "John Mayer's Tone", I'm really disappointed with the OD channel !

Why ? Because the Overtone has so much highs and treble on the OD channel (it's sounds aggressive). I've already change the OD trimmer for less gain et a smoother sound but it's still to edgy.

The amp still need some tweak. I'm currently selling some gear to get some cash to buy some other stuff (other guitar) and to mod the amp with my amptech.

My amp have the actual layout from Ceriatone (which contain a big part of J.Zucker mods). But it's still to edgy. For those who's wondering I mainly play stratocasters through an old 4x12 Marshall Cabinet loaded with G12-65 or a 1x12 with a EVM-12L (these speakers are not "harsh/trebble" speakers !

I'm sure I can get closer to a Two Rock with a few tweaks for the OD channel I don't think it will sound like the real thing but I'm sure I can get close.

Keep in mind that John Mayer doesn't really use his OD Channel, he mainly use his two rock as clean amp and running his pedal through it (T808, Marshall BB-1, Keeley Katana, Keeley Blues Driver and Hermida Zendrive) for his dirty sound.

His Two Rock's signature is mostly a Clean amp !

For instance I'm also playing the Overtone on the clean channel and running my pedal through it (Fulldrive 2, a Xotic BB Preamp and also a Marshall compressor).

With the Fulldrive and a Strat I can get pretty close to "Good Love Is On The Way" type of tone. But if you want something more "liquid" / "cooler" / "smoother" it's another story. The only way I find is to roll of the volume knob of my guitar pretty low and dial with the tone controls of my strat. But when you do that you miss a lot of precision in your sound and it's doesn't sound very good.

I think that for a John Mayer tone, you can also go for a Super Reverb / Twin maybe a Bassman or a Pro Reverb with few pedals, and you will get close too.

I really dig the Two Rock Custom Reverb Signature sound but the Ceriatone doesn't do it (I'm not bashing the Overtone it's just doesn't suit my taste for the moment).

After the tweak were done (if you have any suggestion about tweaks / mods please tell me), I will make a review of the Overtone and I hope I will be 100% satisfied.

That was my opinion

Before you do any mods try a 5751 in the V2 position with the trimmer at 8:30-9:00. YOu could also try and AT7 in V2 without doing any harm but that is a lot lower gain, you might have to turn the trimmer up a notch. I also think the TR are voiced differently, the clean is brighter and less warm than an OTS, but there does appear to be significant differences between different Ceriatone OTS's

Another thing I'm going to try is an AT7 in the PI position, not sure what the effect will be but will let you know when I do. (It will be a while, I need to try it at rehearsal, home volumes won't really tell you much)