John Frusciante’s Electro-Harmonix Holy Grail V1 Reverb

John began using the Electro-Harmonix Holy Grail Reverb around the time of the By the Way release, circa 2002. It was a regular feature on his pedalboard during the album tour, which suggests the same unit was likely used in the studio sessions. This pedal also played a prominent role throughout the Stadium Arcadium era.

It’s worth noting that the Holy Grail hasn’t been spotted on John’s pedalboard during the Unlimited Love era. (See: John Frusciante’s 2022 Pedalboard).

Holy Grail and the Clean Sound

Most of the time, John had the Holy Grail set up between his Boss CE-1 Chorus and his Marshall Major amp. To clarify, the CE-1 was primarily used to split his signal between two amps: a Marshall Major for his clean sound and a Marshall Silver Jubilee for his crunch tone. (Thanks to Beardog for pointing out the earlier mix-up regarding this setup!)

This configuration highlights the critical role the Holy Grail played in shaping John’s clean sound—at least when used in this specific way.

In the Studio

In a 2006 interview with Guitar Player magazine, John revealed that the Holy Grail was featured on several tracks from Stadium Arcadium. For example, it can be heard on “Hey” and “Animal Bar” (set to spring mode), and on “Strip My Mind,” where it was paired with a Big Muff fuzz for the solo.

As for the By the Way album, there doesn’t appear to be an interview where John detailed his effect usage. If you come across one, feel free to share it in the comments below!

Vintage vs. Modern Holy Grail Models

John used a vintage Holy Grail Reverb model, which is now only available second-hand. The closest alternative is the EHX Holy Grail Nano, which offers similar functionality on paper—though many fans believe the original sounds far better.