First of all this is not really a review. I just try to tell my experiences with this amp. Features: you already know if you reading this. If not, than google them... I got this amp for a while now and the stock Ruby High Grade tubes are OK/good. I think this amp could sound much better though. On other forums people found that the factory Bias setting is way to low and after some tweak the amp sounded much better, even with the stock Ruby 6L6s. I have to experiment with this yet. The clean channel sounds good enough. No separate gain and volume controls, only 1 volume (which labelled as gain). And the 3 band tone controls are shared with the OD channel. These might be a drawback to some but for me this amp is barely on the clean channel anyway... The clean channel sounds crystal clear. With the boost function you can have that break-up sound, but this amp is not designed to get Fender-ish blues tones. I found that the clean channel is way too loud. I'm thinking to change the clean channels tube to 12au7 or 12at7 to get it quieter and a bit warmer. The OD channel is not as high gain as most of you would think, BUT(!) the structure and attack of the gain is great. You can turn the gain all the way up and still sounds good. (I heard so many amps with "high gain" labels but they were too dark and fuzzy on high-gain settings to use it for tight metal tone. For me anyway.) The boost is not just a simple boost function. It affects 4 different gain stages, and changes the frequency responses. So the boost channel is really a 3rd channel. It's not a lead channel! I use the boosted OD channel as my main rhythm tone for tight metal sounds (Death metal, old school and new alike). The master volume is great on this amp. I'm able to practice with this amp at home (paper thin walls, and loads of neighbours around) without sacrificing the tone. (Although you can feel the "assembled in China" here, since the pot quality itself isn't that great. I mean you clearly can fell and hear the taper is not a great quality in this pot for minimal/low volume settings) Many people stated that this amp sounds best with v30 speakers. I have to agree. Also It is important what type of speaker cab you using. My 1x12" H&K cab sounded much better than a 4x12" Marshall 1960 Vintage. Obviously i might have been biased... but this is how my drummer mate heard as well. Since I would like to change the tubes I made my research about he tube layout. Even sent an email to Randall and this was their answer: T1 is 1st stage overdrive T2 is clean T3 is 2nd stage overdrive Mike Fortin himself stated on another forum: "Facing the amp, left to right..V1 is OD stage 1 and 2, V2 is for the clean channel, V3 is OD stage 3 and 4." And here is a catch! Most people claimed that this is not true, from left to right: V1 & V2 Od channel, V3 (far right) is the clean channel. Some suggested that the tubes are not in the usual 1,2,3 order on the PCB. I haven't find any pictures of the inside/PCB of these amps so I decided to take it apart. I can confirm, on the PCB it's printed in the following order (facing the amp, from left to right) T1, T3, T2 So all in all Randall and Mike were right, about the numbering but not the order. It seems (Facing the amp, left to right) Position V1 = T1 = OD 1st and 2nd stages Position V2 = T3 = OD 3rd and 4th stages Position V3 = T2 = Clean channel (2 stages) Just above the power tubes there are 2 trim pots on the top of the chassis. I bet these are for set bias. Although I don't know why, since you have to take the chassis completely out anyway... So these easily could have been inside as well... (And someone could enlighten me how to do a proper bias setting.) There are loads of solid state components (ICs) as well. I do not mind this at all, just wanted to point them out. I took many pictures but i hope the above are more then enough.