How can I check if my amp FX loop is serial or parallel

Question

My guitar amp has a FX loop, but I don't know if it is serial or parallel?

Answer

On most amps, you could apply the simple folowing test

Take a jack cable and insert it in the return of the loop. Play on your guitar:

  1. If you do not get any signal in the output, you have a serial loop
  2. If you can still hear your guitar, it is because you have a parallel loop.

In this case the amp will have a mix control to adjust balance between direct path and loop return (Dry/wet)

On many amps setting this control to 100% (maximum) will turn the loop into serial. Then you should experience option 1. (no signal in the output).


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