Ramble FX Marvel Drive

Request, thanks to PedalBlotter for his hard graft in tracing the circuit.  This is a bit of an awkward circuit to try to find a good middle point to do it on two levels (like my Muff layouts) and have an even spread of components on the board, so I've just done it in a long single row.  At 25 x 10 it will still easily fit in a 1590B rotated 90 degrees with lots of space at the sides :o) but I've also included a vertical layout for those who would prefer to build it that way.

Info about the original:

Great for AC/DC, Led Zeppelin, Hendrix and more!

From the KRRR-ANG of the high strings to the growl of the low strings, Marvel Drive delivers all of the tone that made the Marshall™ plexi legendary.

Topped with a genuine plexi faceplate, the Marvel Drive uses 4 separate JFET gain stages to create the ultimate in touch sensative, dynamic distortion. Each stage contributes to the harmonics and distortion in much the same way each tube does in an amplifier.

A well known secret to great tone out of the vintage, 4 input Marshall™ amps is to use a patch cable to connect 2 of the inputs together. When this is done, the HIGH TREBLE and the NORMAL volumes can be blended together for the perfect crunchy combination.

That is what Marvel Drive recreates. Marvel Drive uses 2 JFET gain stages in parallel, one with a bright and throaty scream, and one that brings the thump of a full stack. This configuration delivers a powerful way to get the perfect setting.