EHX Holy Grail Whine Repair [Archive] - Telecaster Guitar Forum

guitar_paul1

February 2nd, 2012, 02:43 PM

Hi.Lurker here.

I just fixed my ElectroHarmonix Holy Grail this weekend and thought I'd share because it turned out to be so easy.
The details and photos are over at the Steel Guitar forum Electronics section.
Bottom line is that I think the pedal was designed to feed into a longer cable, so the 350pF of cable capacitance would do the filtering for you. I never use mine with a long cord coming out, so naturally I would experience the whine of the digital system.

Anyway, you just throw a cap across the signal output of the circuit board (before the bypass switch so it's out of the ckt in bypass mode) and ground. Generic .1 uF worked fine. Quiet as anything now.

http://bb.steelguitarforum.com/viewtopic.php?t=219734

All the best.

-Paul

122 Vega

February 5th, 2012, 11:26 PM

Thanks for this, I hope it works. My Grail whines but only if i have it hooked up to my iSpot. If I plug it in away from my other pedals it works flawlessly. Very frustrating.


	Telecaster Guitar Forum > The DIY Channel > Burnt Fingers DIY Effects > EHX Holy Grail Whine Repair PDA EHX Holy Grail Whine Repair guitar_paul1 February 2nd, 2012, 02:43 PM Hi.Lurker here. I just fixed my ElectroHarmonix Holy Grail this weekend and thought I'd share because it turned out to be so easy. The details and photos are over at the Steel Guitar forum Electronics section. Bottom line is that I think the pedal was designed to feed into a longer cable, so the 350pF of cable capacitance would do the filtering for you. I never use mine with a long cord coming out, so naturally I would experience the whine of the digital system. Anyway, you just throw a cap across the signal output of the circuit board (before the bypass switch so it's out of the ckt in bypass mode) and ground. Generic .1 uF worked fine. Quiet as anything now. http://bb.steelguitarforum.com/viewtopic.php?t=219734 All the best. -Paul 122 Vega February 5th, 2012, 11:26 PM Thanks for this, I hope it works. My Grail whines but only if i have it hooked up to my iSpot. If I plug it in away from my other pedals it works flawlessly. Very frustrating.