The FAT HEAD represents the culmination of years of research and development invested by Sherlock Amplifiers in creating an amplifier with an entirely analogue tube powered audio path that can be shaped and controlled with almost infinite potential. Covering sounds from bell like clean to classic crunch rhythm to heavy modern rhythm to creamy super hi gain, it is the most flexible, best sounding, all tube amplifier ever made.
The FAT HEAD's features and controls have been carefully chosen and fine-tuned to bring you pristine tone and unprecedented versatility. 4 channels, each with 3 voicing options plus a mid scoop option gives you a total of 24 sound possibilities, not taking into consideration a highly effective EQ. And that's just the preamp! Then add the option of Master Volume, A or B, the uniquely voiced Presence A or B, each with a depth button, makes 192 sonic combinations. Then with the addition of a multi effects unit to the effects loop, operating in either series or parallel, gives you … well, you get the idea.
The use of state of the art tube circuit design, coupled with high quality components used throughout, puts the FAT HEAD in a league of its own in both performance and reliability. We are yet to find anything that comes close to creating such an expansive range of high quality, exceptionally musical sounds, let alone delivering it with such a staggering level of flexibility and controllability. So whatever your style of playing, the FAT HEAD has your sound!

Channel Description
The Clean channel provides an array of clean tones that fatten with a subtle compression as the gain setting increases. With the Bright switch in the "Normal" position, the clean channel is smooth and mellow. Shifting the Bright switch to the "Bright" position, the guitar's high harmonics are boosted for sweet sounding rhythm playing. The "More Bright" position gives exceptionally crisp and responsive tones with extra brilliance. A little tweaking will give you access to round Jazz tones, bright spanky funk sounds, through to sounds suitable for a dark smoldering metal epic.
The Edge channel takes over where the Clean channel leaves off; low gain settings are clean with the addition of a slightly edgier quality. With the voicing switch in the "Normal" position, increasing the Edge Gain control is like a tour of cool, super smooth Blues tones. The 'Bright' position of the voicing switch adds a shimmering jangle suited to 'Britpop' type sounds. In its third position, the voicing switch increases the tube breakup for a sound that sets a new standard in classic hard rock tones. Engaging the Gain switch on the Edge channel takes you beyond turning up to eleven! No matter what your preferred setting, the Edge channel is alive and dynamic, extremely responsive to every nuance of your playing.
The Rhythm and Lead channels of the FAT HEAD are this amps strongest suit, providing an absolute arsenal of classic and modern high gain. They cover a staggering amount of variation in tone, from hard rock to utter heavy metal meltdown. Each of the two channels have there own 3-position voicing switch, a push button 'Gain boost' switch for EXTRA gain, plus the Mid Scoop option. These tone shaping tools can be set to make the two channels sound very similar with only subtle variation, or set to give two wildly different flavors. Whatever your tonal preference for high gain sounds or even how high you like to go, the FAT HEAD maintains a unique harmonic richness and remains articulate and musical.

MIDI CONTROL
Like many of the features of the FAT HEAD, the midi control of the functions of this amp sets it apart from all the rest. Simply with the Fat Head’s built in Midi Mod, its is possible to combine, sections of the Fat Head’s features, for example the rhythm channel with the Effects loop in, using the Presence A, and the Master B, saving them, assign them to a patch number and recalling that same combination. Even the settings in your effects unit can be recalled by hitting one switch on the Fat Heads Foot Controller. How many times can I do this you say, 100 times, i.e. the Fat Head will save and recall 100 combinations of it features. And it’s so simple to do.

1. Select a patch number on the Fat Head Controller or any MIDI Controller.
2. Select the amps channel or function using the corresponding buttons on the Fat Head.  The led or leds on the Fat Head light up to indicate which channels or functions have been selected. 
3. Press and hold the “Prog” button for 2 seconds. The Fat Head will now save this combination and assigned it to the patch number selected on the Foot Controller (in step 1), and your done.

To check your programming has been successful, select another patch number on your Midi controller and then select the one you selected in step 1, and the Fat Head will recall your programmed combination.
Please note that due to the sound possibilities of the Fat Head a simple footswitch is not provided as this would severally compromise the sound possibilities that are archived by the MIDI Controller. However if a Full Blown MIDI Controller freaks you out, we have designed a simple 10 button Controller for the job.

Developed by Sherlock Amplifiers, the TUBE MANAGEMENT SYSTEM is a straight forward, easy to use TUBE BIASING SYSTEM, designed to allow the user to:
Check and adjust Individual tube bias.
Install new tubes and bias them correctly.
Identify and replace faulty tubes, and maintain the power stage of the Fat Head tube amp for optimum performance. (Please note that this is all done without any external meter or other equipment!)
The 3 main areas of operation are:
Tube biasing using 4 individual bias pots.
Visual monitoring of tube bias with 4 sets of Bias Status LED's.
Protection and damage isolation of the amp in case of tube failure with 4 individual fuses.
So this means you never have to take your Fat Head to a Tech for a re-tube...you can do it yourself!

Now this can open up some tonal possibilities that were impossible before, like using 6L6 and EL34 together or anything else with an Octal base like 6550's. If that still not enough,  with T.M.S. you can control the output tubes Class of operation from class AB to more class A and even have true, adjustable Simulclass. (Any 2 tubes class AB and the other 2 tubes class A) its total wild!
As an example of the flexibility of T.M.S., the Fat Head could be fitted with 2 x 6L6 tubes, and 2 x EL34 tubes. The BIAS REF. pot would be set to 35mA, a good average for both the 6L6’s and EL34’s and the Individual bias pots would be adjusted for evenly lit BIAS IND. LED's. Both sets of tubes would be running in class AB.
Now onto the Simulclass possibilities.
Suppose you want to run the 2 x 6L6’s closer to class A. Set the Bias Ref. pot to say 40-45mA and adjust the BIAS POTS on the 2 x 6L6’s for evenly lit BIAS IND. LED's and you done! The opposite can be done as well. Or all can be set closer to Class A or all can be set to class AB as we started.

Every amplifying stage has been positioned for perfect operating stability, minimal inter-action from other stages, low noise, low hum, low cross talk, etc., ensuring fantastic performance and best tone.
Another advantage of maximizing the Fat Heads PCB design are that there is minimal internal wiring with all its disadvantages like increase noise, instability, connector reliability and cost. In fact the few connections that could not be accommodated by the PCB are wired and soldered directly for the highest reliability. There are only a few connectors used that are absolutely necessary from a service perspective.
Moving closer to the heart of the Fat Head, we have the cool running, generously sized transformers.
Firstly the power transformer is a custom hand made design proving all the necessary voltages for the Fat Heads circuitry to operate from. The output transformer is also a custom hand made design using grain oriented steel and double insulated copper wire for the highest reliability.
And finally the Tubes. For the Preamps we have found that the Fat Head sounds best with JJ12ax7. We spend time selecting by ear the best tubes for low noise and best tone in all the Fat Heads stages. And for the power stage we us 6L6 or EL34 Svetlana winged “C” or JJ's for there tone and reliability. Tubes are matched and individually biased perfectly with the Fat Heads TMS. Biasing system.

So from what you have just read, it should now be obvious that the Fat Head is no ordinary amp, and we ask that if you are in the market for a state of the art tube amp please enquire about a demo of the Fat Head.