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MI Amplification
Owner's Manual
1. Welcome
Hi there! I'd like to take this opportunity to thank you for purchasing the MI Amplification Megalith
Gamma vacuum tube guitar amplifier. The journey of creating the Megalith series of amps has
been the most challenging and rewarding one to date. I created the Megalith amps based on the
requests of customers and retailers who were searching for a definitive high gain tone.
Since the release of the Beta two years ago, perhaps one of the most satisfying things for me has
been the fact that the Megalith design has taken on a life of its own. With the weight of 60 years of
guitar amplification history on our shoulders, it can often be a daunting task for a designer to go out
on a limb and create something new. It's so exciting for me to be contacted by musicians who want
to get their hands on a Megalith, not because it sounds like "X" or "Y", but because it's an amplifier
that sounds and feels like nothing they've heard before.
I guess if you're reading this, you'll already be familiar with the Gamma's big brother, the Megalith
Beta. My idea with the Gamma was to take the design of the Beta, and to simplify the control set,
to create a deceptively simple and 'classic' high gain amplifier layout. But the most important
things, like the award-winning tone and high quality construction of the big fella are part-and-parcel
of the Gamma's DNA.
For those of you not familiar with the Megalith story, here's a quick recap.
What started out as a relatively standard high gain design quickly evolved into something quite
different. Whilst not many designers would be willing to admit it, the vast majority of amps rely on
old formula. I must confess that the earliest incarnations of the Megalith followed the same
principle. However, it became quickly apparent to me that the 'old' ingredients just wouldn't do, and
wouldn't lead to something 'new'. So, the off-the-shelf building blocks were abandoned. Starting
with a clean sheet of paper, virtually every element of the amplifier was redesigned for ultimate
performance.
By the same token, I wasn't interested in creating an amplifier which could only be used as a high
gain behemoth. I wanted the Megalith to have a genuinely great clean channel, and to have an
overdrive channel which could also be used in low gain mode for great light breakup tones, for
more traditional guitars, styles and tunings. The Megalith is not only a cutting edge high gain
amplifier, but can also be used for more traditional tones, and as a high headroom, clean amp for
running with a pedal rig.
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Summary of Contents for MI Amplification Megalith Gamma

  • Page 1 Owner’s Manual 1. Welcome Hi there! I’d like to take this opportunity to thank you for purchasing the MI Amplification Megalith Gamma vacuum tube guitar amplifier. The journey of creating the Megalith series of amps has been the most challenging and rewarding one to date. I created the Megalith amps based on the requests of customers and retailers who were searching for a definitive high gain tone.
  • Page 2 Michael Ibrahim MI Amplification 2. Precautions In order to get the most out of the Megalith Gamma, please make sure that you follow the points: • Make sure that the power outlet is the correct rating as stated on the amplifier •...
  • Page 3: Power Amp

    FX Loop • The FX Loop in the Megalith Gamma is a high voltage buffered FX loop with send and return level controls. When the loop is turned off, the whole of the active circuitry is switched out to retain as pure a signal-chain as possible.
  • Page 4: Getting Started

    4. Getting Started • Unpack the amplifier head and make sure that you remove ALL packing material. • Connect an appropriate speaker to the correct speaker output. • Connect the power plug into the amplifier. • Plug your guitar into the amplifier. •...
  • Page 5 Bright Switch The three position bright switch can be used to add a subtle shimmer, or a more pronounces high boost to the tone. In the middle position, the bright switch is off. This is a good choice for brighter pickups.
  • Page 6 4. The Megalith has been designed with more gain than I can ever imagine anyone ever using. With gain (especially live), always remember the golden rule: LESS IS (more often than not) MORE. Now that we’ve dispensed with the formalities, lets sink our teeth in. Selecting the OD Channel There are two ways to activate the OD channel: 1.
  • Page 7 5.3. A Quick Guide to EQing the Megalith Gamma. At first glance, it may appear that the shared EQ for the clean and overdrive channels will limit or compromise the voicing of the two channels. However, a great deal of thought has gone into design of this EQ in order to make it flexible enough to meet the needs of both channels.
  • Page 8 6.1. FX Loop The Megalith Gamma’s series FX loop is a buffer, high voltage design, with very low output impedance, and very high input impedance. It also features send and return levels, which mean that you can use any type of effects in the loop. To use the loop: •...
  • Page 9 • To connect one 8 Ohm cab, connect it to the 8 Ohm speaker output. • To connect two 8 Ohm cabs, connect them to two 4 Ohm speaker outputs. • To connect one 4 Ohm cab, connect it to the 4 Ohm speaker output. 8.