Elan Memran – an amp designer/technician who worked in the Los Angeles area in the 1980s. His Metalhead Electronics modifications were primarily applied to Marshall amps, particularly JCM800s and Plexi/Super Lead-type circuits. RRig-Talk+1

What made the mod special?

The basic idea was to take a Marshall that already had a great aggressive tone and add additional preamp gain stages inside the amplifier rather than simply hitting it with a distortion pedal.

On some versions, the added circuit could be switched in and out. With the mod engaged, you could get dramatically more gain while retaining the characteristic Marshall attack. One documented version adds two gain stages and places them into the circuit before the cathode follower. RRig-Talk+1

The result is roughly:

Stock Marshall → extra gain stages → much more saturation → tight, aggressive high-gain tone

Many versions also incorporated:

• Extra gain controls
• Bass boost
• Built-in noise gate/noise reduction
• Switching that allowed the amp to return to essentially its stock Marshall circuit RRig-Talk+1

The really famous connection: Fear Factory

This is where the mod becomes especially interesting.

Dino Cazares used a Memran-modified Marshall, and the sound became strongly associated with Fear Factory’s early records, particularly Demanufacture.

That extremely tight, mechanical, aggressive rhythm tone is one of the reasons the Memran mod has become so sought-after. Contemporary owners specifically describe these amps as capable of the tight, percussive sound associated with Demanufacture. RRig-Talk+1

Why guitar players still care about them

The interesting thing is that it’s not just “more gain.”

A normal JCM800 pushed with a Tube Screamer, for example, gets more saturation by boosting the amp’s existing input. Memran’s approach fundamentally changes the preamp architecture.

That’s why people describe these amps as having a very distinctive combination of:

high gain + tight lows + aggressive mids + fast attack + lots of saturation

And they’re extremely rare. Original 1980s Memran-modified Marshalls turn up occasionally, but they’re much less common than the better-known Jose-modified Marshalls or later Friedman-style modifications. Recent examples have been offered for several thousand dollars. RRig-Talk

There’s also an interesting modern development: Memran’s work is now being offered in new forms, including a current Metalhead circuit and external modification system intended to reproduce the original concept. Eelanamps.com+1

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