Amplifiers MI Audio Revelation Amplifier Head Pre-Owned

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The Revelation Mk II is an all vacuum tube amplifier that provides flexibility beyond your wildest dreams. Imagine an amplifier that can provide four completely independent and uniquely voiced channels, capturing a huge range of warm valve tones, from pristine clean to all out high gain. When you change channels, it doesn’t simply sound like variations on the one basic tone. It feels like you’re changing amps. The character, feel, dynamic response and frequency content is radically different from one channel to the next.

Each Revelation amplifier preamp features:

  • Four completely independent and uniquely voiced channels, capturing a huge range of warm valve tones, from pristine clean to all out high gain. There’s no repeat of channel voicings.
  • Each channel can run clean, crunch of high gain, thanks to the 3 position gain switch, for a total of 12 different preamp voicings (4 channels, with 3 modes per channel). For the first time ever, you can set up an amp with 4 distinction clean tones, or 4 high gain tones, or any combination… it’s up to you.
  • Dual master volume for solo boosts.
  • Four independent FX loops, which you can assign to ANY channel. Each channel remembers which loops are assigned to it.
  • MIDI switching capability for channel, gain mode, FX loops and master volume.

Mated to this amazing preamp is an equally impressive power amplifier with the following features:

  • Three output power levels (High, Mid and Low)
  • Triode/Pentode switch.
  • Power amp presence and depth controls.
  • Three levels of negative feedback (High, Low and Off)
  • The ability to accept most common octal based power tubes, such as KT66, KT77, KT88, KT90, KT100, 6550, EL34, 6CA7, 6L6,  5881, 6V6, and 6K6.
  • Output power anywhere from 100W down to 1W by choosing the appropriate tube and power amp configurations.
  • External bias points for easy tube swapping.

With the Revelation, each channel captures a unique philosophical approach to preamp design. The four channels capture what we consider to be four pivotal preamp voicings. Whilst in no way a ‘clone’, each channel seeks to create the vibe of some of the great guitar tones, past and present. Then by altering the gain structure, each channel’s possibilities are extended to create gain modes, all of which are ‘projections’ of the basic characteristics of that channel. For example, ever wondered what a traditionally vintage ‘American’ voiced preamp would sound like with a couple of extra gain stages added? What about applying the design principles of modern high gain designs to tamer crunch, or even clean voicing? Now you can begin to see the amazing possibilities the Revelation has to offer.

Channel 1 (Green) is inspired by the traditional American preamp designs from 50’s and 60’s. One of its unique defining characteristics is the position of the tone stack, which is at the beginning of the preamp as opposed to the end. This channel has the lowest gain of all 4 channels, and is aimed more at the vintage side of things.

Channel 2 (Yellow) is decidedly British in nature. The mids are a lot more forward, and the position of the tone controls (at the end of the preamp) completely changes the character of this channel, compared to channel 1. This is another channel which we would consider to be ‘vintage’ voiced.

Channel 3 (Blue) is what happens when you take Channel 2, and mod it to the max. It’s definitely a ‘modern’ channel. Inspired by the hot-rodded, custom amps of the 80’s and 90’s, this channel exhibits a tight controlled low end, a precise high end, and huge midrange response for cutting through the mix.

Channel 4 (Red) is the alter-ego to Channel 3. Also a ‘modern’ channel, it’s everything that Chanel 3 is not. At every stage of the preamplifier circuit, the signal is handled in the opposite way to Channel 3. This creates a sound, which in every mode, is the counterpart of Channel 3. Instead of ‘thin’ and detailed, the Low gain mode is dark and moody. Instead of focused and fast, the Mid gain mode is fat and momentous. Instead of cutting a controlled sonic path, the High gain mode forces its way through with sheer brute power, pushing aside anything in its way.

Output Power and Tube Configuration

To start with, the power and output transformers are a completely new design. Both transformer were designed in house and custom made to our spec. They are double shielded toroidal  transformers (yes, even the output!) for ultra low noise, which we have load tested to 400W to ensure longevity.

Secondly, intelligent circuitry reconfigures the operating voltage of the amplifier to suit almost any octal valve type, including KT66, KT77, KT88, KT90, KT100, 6550, EL34, 6CA7, 6L6,  5881, 6V6, and 6K6. Just choose the correct tube class, follow the bias instructions and the amplifier takes care of the rest. Most amplifiers which offer tube swapping are really only designed to work for a particular type of tube. Substituting other types in these amps usually results in the ‘under utilisation’ of a larger tube’s capacity, or pushing smaller tubes way past their spec. The Revelation is different, in that it reconfigures itself to work with the tube. So for example, the Revelation will produce a full 100W from a pair of KT88s, and no more than 20W with a pair of 6V6s. Please refer to the instruction manual for a detailed list of tubes and their performance.

Once you’ve chosen your power tube, there are a few different ways you can set the power amp’s tone and performance. The first of these is the variable output power switch, located on the rear of the amplifier. By varying the internal high voltage applied to the tubes, it is possible to vary the output power of the amplifier between High, Mid and Low (which corresponds to approximately 100%, 60% and 30% for most tube types). This reduction in the high voltage also applied to the preamp tubes, so these settings not only affect the power amp section, but also the preamp. The lower the output power, the quicker the preamp tubes clip, and the more compressed the tone.

For each output power mode, there is an independent bias controls, so your can optimise the bias for each power level.

A further reduction of the output power is possible using the screen configuration Triode/Pentode switch. This not only affects the output power, but also the tone of the amplifier. The transfer characteristics of triodes is very different to pentodes, and the resulting tone is much ‘softer’. The open loop gain of the power amplifier is also reduced in triode mode, making the power amp response much looser, and the presence and depth controls less effective. This is a great ‘vintage’ tone.

To top this off, we also offer two circuit upgrades:

  • Any or all of the standard series FX loops can be upgraded to Pro FX loops. These loops features individual ultra low noise buffered circuitry, a level select switch (guitar or line level), send control, and FX mix control for series/parallel operation.
  • A 3 position cathode configuration switch, allowing you to choose between fixed bias (standard), cathode biased (sometimes referred to as ‘class A push/pull’ and something we call ‘cathode dynamic’, which is a lower output, spongier version of cathode bias.
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