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Created in conjunction with guitar prodigy and Grammy Award-nominated singer–songwriter Marcus King, the MK Ultra is our first-ever amplifier designed with Orange USA and built in the USA. Using the highest-quality components available, including American-made custom Heyboer transformers, this hand-wired 30-watt all-valve guitar amplifier represents a marriage of classic American and British tonal sensibilities. Make no mistake though, this is not a copy of a previous design with slight modifications. This is a unique innovation that offers a new approach to the trademark Orange sound.
The MK Ultra features carefully tuned input circuitry that not only responds amazingly well to different volumes and tone settings on your guitar but also takes pedals extremely well and moulds them into the tone instead of sitting them on top. This is driven by a pair of 12AX7 preamp valves feeding into a power amp section consisting of two 6L6GC power valves that are cathode-biased. This choice of output valves is a first for Orange, bringing out all the harmonics and touch sensitivity that Marcus demands.
Although this is a unique artist signature model (only 150 made), players from many different genres will be able to dial in their own tones and sounds. From country to blues, classic rock to jazz fusion, and everything in between, the range of this simple three-knob design has to be heard to be believed.
This one-of-a-kind circuit design features EQ controls in different parts of the circuit that are totally independent. The specific ranges and frequencies of these controls were voiced for Marcus, making it impossible to dial in a bad sound.
The Volume knob on this amp is as much a tone control as the Sing and Deep controls due to the circuit design and how it interacts with the dynamics of your playing. With the MK Ultra being a cathode-biased amp, it is urgent, with a fast response time at low volume settings, making it a perfect partner for your pedal board. As you increase the volume control you will hear more saturation with the 6L6s starting to break up, giving you a spongy attack that will start to sing and make you want to play more and more. Even at full volume, you still have clear control via your guitar’s volume knob.
This can also be described as a variation input bright control, bringing you the tone you need for the atmosphere you’re playing in. Adjust the sound to pair perfectly with your guitar.
Think of this as more of an overall thickening to the sound. Start with it all the way down and, after finding the Volume and Sing levels you want, increase the Deep control until you find the thickness you want.
Orange Marcus King MK Ultra Signature Guitar Amplifier Head Specifications