Looking for the EHX Holier Grail schematic

[j_flanders]

I'm looking for the Holier Grail schematic.
I mainly want to see how it differs from the regular Holy Grail schematic. Especially the input and output section.

At some point it must have existed online as I saw Mark Hammer posting a part of it over here:
https://music-electronics-forum.com/forum/effectification/guitar-effects/42519-holy-grail-reverb-mod#post613843

[Ben N]

Carry on.

[Mark Hammer]

Not sure where I got it from, but I converted the PDF into a pair of GIFs.  Here's Pg 1 and Pg2.

[j_flanders]

Many thanks Mark!

The schematic confirms what my ears were telling me, comparing the Holier Grail to the Holy Grail.
The Holier Grail's input has lower impedance and much more headroom (100k and 12V Vcc) than the Holy Grail(270k and 5V Vcc).
The difference is very apparent with my Jazzmaster and its 1M volume and tone controls.

I'm still trying to figure out the output section and how they compare and what audible differences there could be.

The Holier Grail has none of the whine and hiss that the Holy Grails were plagued with.
But I much prefer the sound of the dry path of the Holy Grail.
With a buffer in front I'd probably could not tell them apart.

I'm very familiar with the Holy Grail schematic after trying lots of stuff eliminating the hiss and whine in this thread:
https://www.diystompboxes.com/smfforum/index.php?topic=127273.0
It's very interesting to see what they did in the Holier Grail.

[anotherjim]

It's very interesting in the power supply. Note the use of ground symbols to denote 2 Vref supplies which are opamp buffered. Does that remind anyone of the 3086 tremolo thread nearby? Also, some provision for RC + supply filtering but with 0ohm fitted.