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JCM800 Mods

1. Full Custom Marshall 4010 Master Volume – True Dual Channel

The stock 4010 JCM800 has a high gain input and low gain input with a single set of shared controls.

That’s not so handy if you want to change from clean to crunch in the middle of a live performance.

In this customization, the single channel amp has been transformed into a true dual channel with a full set of volume, tone, master and presence for each channel that is selected by a foot switch or panel button.


The original JCM800 4140 control panel


A close up of the custom front panel


Complete with a new front panel designed by ourselves. Others have added the input jack switching to these (e.g Dr Tube) but only add the gain controls. Here you have individual control of everything for each channel.