EHX Holy Grail "Interfering" with Tube Screamer

[13eastie]

I've recently obtained an EHX Holy Grail pedal.

Everything seemed fine until I put it in the same signal path and downstream of my Tube Screamer.

With both pedals on the same mains supply, there is a wailing sound like a faint siren which is resolved only by removing either of the pedals from the signal path (not really an option) or powering them from separate supplies (damned inconvenient).

I've heard of noise issues with amps being on the same supply as pedals, but not a problem like this with one particular pedal.

Is this normal for a Holy Grail?

Is there anything I can do to prevent it?

Cheers...

 

[Dandy13]

the big box holy grails require a seperate PS or they will be noisy

 

[13eastie]

the big box holy grails require a seperate PS or they will be noisy

Apologies, I should have mentioned that mine is a Nano.

 

[Bluedano1]

Mine old original model Holy Grail used to make a high pitch whining, almost like a squealing preamp tube noise (in the background, but it would drive me nuts) like it was picking up electrical interference- I had to stop using it. Shame, as the Reverb was pretty good...

 

[stinkfoot]

How are you powering it? As mentioned, the original Holy Grail was very picky with its power source (it almost always needed the supplied adapter), and while the Nano version is better, it could still need its own power source.