Pedal board hum with Marsha (Dave?)

[supersonic]

Dave I'm getting a loud (what sounds like an earth loop) hum with my Marsha. It is only when I use the loop,and worst if I try to power pedals (from a transformer) in front of the amp and in the loop at the same time. There is no hum when I use batteries.
Here's the chain:
In Front- RMC Wah- Sonic Research tuner
In Loop- T Rex Replica delay- EHX Nanoverb- Boss Flanger
Power Supply- T Rex Fuel Tank

I get the hum as soon as I use any pedals simultaniously in front and in the loop. I am using batteries in the F/X in front to solve the problem ATM. Any ideas?

 

[RACKSYSTEMS]

Yes use a isolated power supply like the voodoo lab or the glab. You have a ground loop. Your board will be much better when done.

 

[supersonic]

Yes use a isolated power supply like the voodoo lab or the glab. You have a ground loop. Your board will be much better when done.

Thanks for the reply Dave. I have one pedal that needs 12vAC and the Voodoo Lab does not supply AC. Could I keep the T Rex Fuel Tank to power the loop FX and run a Voodoo Lab to power the FX up front?
Or alternatively would this work, cioks AC10 https://www.ebay.com.au/itm/BRAND-NEW-CI ... 58931bdfb9

 

[RACKSYSTEMS]

Yeah the cioks will work.

 

[supersonic]

Problem solved Dave. After much research I went with the T Rex Chameleon. It has 5 isolated outputs supplying 300ma from ea (needed the 300ma to power the "Replica Delay").
It screwed straight up to the old power supply mounts. Thanks so much for the help, I appreciate it.