Grampian Reverberation Unit Instructions & Schematics

Below you will find various pieces of original Grampian documentation, including tech specs, schematics and articles, which you can view and download from the links below. Note that these were given to us to distribute and are free to use, however if you use, re-post or share them then please add a credit and a back link.

- Original Grampian Reverberation Unit Type 636 Instructions - reproduced into a searchable format, and including instructions for the Direct Signal Path (wet-only) Modification

- Original Grampian 636 Brochure & Technical Specification

- Schematic: Grampian Type 636

- Schematic: Grampian Type 636 Power Unit PU/2

- Schematic: Grampian Type 636 wet-only modification

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This page is part of our collection of resources on the legendary Grampian Type 636. Read more about this remarkable unit and see all the information we have gathered over the years here. We're fanatical about these units and sound they can produce if restored to full functioning - if you are looking for one of these units, or have one to sell in any condition, please get in touch.