FX loop alternative

To the left is the previously posted alternative loop modification schematic to change a Mesa Dual Rectifier from a parallel loop to a serial loop.  It’s easy.  Most of the time required for the mod is spent taking the amp apart.  (Here’s a link to a 2 Channel Recto with the same mod.)

The following pictures are provided to show the inside of the amp, the job, and a crappy job someone did of soldering the output transformer to the daughter board.  I used a 22 gauge wire with the insulation removed for a clean, short jumper.  I’ve seen people use insulation for the job, but the space is tiny.  Note that my solder joints look a little matte.  This is from the lead-free, silver solder I used.  Almost every joint looks that way when I use it, no matter what, but it hasn’t been a problem.

Update July 2016: Verified.

Before any work.

Before any work.

Side shot before any changes.

Side shot before any changes.

Jumpered.

Jumpered.

Jumpered, side view.

Jumpered, side view.

Taped off the wires.

Taped off the wires.

Someone did an ugly, poor job on the OT.

Someone did an ugly, poor job on the OT.

Funky!

Funky!

Ah, the lovely glow.

Ah, the lovely glow.

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Comments
  1. Russell says:

    Looking into this for my ’02, 3 channel DR. Thanks for posting this! Does this particular mod retain the ability to engage/disengage the modded effects loop from the footswitch, for all channels? Your article reads that way, but it isn’t 100% clear to me. I realize that the ability to program effects loop per channel is lost, which is fine. I am just asking from a global perspective.

    Thanks again!

    Like

  2. Chad says:

    Seemed to work on triple rec. Still get signal when there isn’t anything in loop though. It’s weak but if I turn it up it’s bedroom volume? Is that normal? Otherwise I been using 4cm with my Helix no problem.

    Like

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