2 effects in the same box (noise issues??)

[Xavier]

I have just finished building a dual Silver LTD overdrive (my layout) / mosfet booster (Torchy's vero) in the same enclosure. Everything is fine except for one detail.

The Silver LTD section works fantastic (this must be one of the best and cleanest TS circuits out there...), but the mosfet boost has a strong and audible background hiss when engaged, plus a hint of a high pitch squeal.

I know it's not the circuit board because I've tried with the fetzer valve first. Same exact hiss, so i used this mosfet boost board I had around just to find out the same problem. My first though has been the wiring but I have checked all wires one by one and they work OK.

This mosfet boost board has been working ok in a different enclosure without problems.

Have I overlooked anything ? any special secret to build 2 effects in the same enclosure? could it be a ground issue?

[Xavier]

OK I found it, just in case anybody has the same issue.

Very simple:

OEM AC adaptor: terrible hum
One spot adaptor: no hum but terrible hiss (this is the one I was using)
Good ol' Boss PSA230G: No hum, no hiss