Electrical hum quandary in pedal chain
Hello wise elders and wise youngers of talkbass,
I have added a new pedal to my pedal chain and am now getting a brutal electrical hum.
I added in a strymon blue sky reverb pedal which claims to draw 250mA. I am running 7 pedals off the 9v DC jacks on my fuel tank classic power supply and also a markbass compressore pedal off the 12v DC jack. The fuel tank claims to deliver 500mA to the 9v jacks and a separate 500mA to the 12v.
The brutal hum disappears when I unplug one of the 9v pedals OR the 12v compressore pedal.
Am I asking too much of my power supply? Do I need a separate power plug just for the strymon?
Any advice welcome. I know nothing about electricity...
Post a pic.
Have you tried moving pedals to different outlets, maybe put the Strymon alone on one of them?
The 12V DC outlet is isolated from the 9V DC outlets in that unit, so normally we would expect no effect on the hum when you unplug the Markbass. But the ground plane is ALSO shared via the patch cords! So there can be some cases where even using an isolated power supply is not a foolproof cure for ground incompatibilities.
As an experiment, plug up all the rest of the chain as usual, but leave the Markbass out. Now plug it into the power supply, but do not connect it in the audio chain. Now does it have any impact on the hum?
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