Effects loop

[klitwestwood]

Pedals- ht dist,ht boost,boss chorus and nux delay. I've tried every possible combination of effects thru the loop and I still get a really nasty hum. I've tried a boss noise surpressor and a ground loop eliminator but still this horrible buzz. All pedals have been tried with separate power supply's and also tried with a caline isolated power supply. Could anyone shine a light on this plz as I'm at my wits end with it,even considering getting a Marshall 5watt instead as I only use it for recording. Someone(the owner of leech amplifiers)suggested cutting the earth wires in the effects loop itself but I'm loathed to do this.

[Arcadio]

Did you try the button that adjusts the level in the effects loop? It should be on the low setting for those kinds of pedals.

Also try running a pedal on battery power. If the hum goes away you might have some sort of power supply or grounding issue.