Recently I have been designing a lot of takes on the Deep Blue Delay for different clients (and so on the Rebote Delay 2.5, Seabed Delay etc. etc.).
I wanted to add the tails mod and found the 2 good options from Vulcano FX using jFETs. However, the jFETs just aren't perfect enough for me. There will always be a little bleeding from drain to source in the open position. Flo at Newtone Forum (dutch) helped by advising adding a 10k to ground after C5 to cut the signal by 40dB, but it still bleeds. If you put a big signal through (say a dimed od) there will still go some stuttering through.
And so I want to go 100% mechanical. Can it be done while still being able switch between true bypass and tails? Yes you can!
Strange enough I couldn't find anything on the web (yes, there was a mention of a possible solution, but no schematic). So I took it on myself to figure out a solution.
Here is the simple solution using a 4PDT footswitch (like this) and a regular DPDT/3PDT footswitch. As you can see the tails switch can be DPDT if you leave out the extra LED.
In the picture below you can see a cutout of the deep blue delay input buffer to see where to cut after C13 (1uF) attached to pin 7 of the input buffer the delay PCB.
Let me know what you think!
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