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Simple Effects Loop

Here is a simple, series, buffered effects loop. This isn't the most sophisticated circuit, but it's one of the easiest ways to implement a tube-buffered loop in your amp.

This loop features both send and return level controls. Depending on where you place this loop in your amp, however, the return level control might not be necessary.

This simple loop is precisely that: simple. It's not the best way to incorporate a loop into your amp. For advanced technical discussion on designing and optimizing effects loops, see Kevin O'Connor's book, THE ULTIMATE TONE VOL. ONE. More information on effects loops is also available from O'Connor HERE.