Grampian 636 Instructions & Schematics

Below you will find links to 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.


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.

More Grampian Goodness

from the blog and elsewhere deep in the site:


Grampian Reverberation Unit Type 636

A growing collection of information about the Grampian 636: history, schematics, manuals, sound & video clips; plus our Soundgas Type 636 project to recreate this iconic...


Gear feature

Gear History

Grampian Type 636 – Believe the hype…

Grampians: some history and technical information about these superb, legendary machines. If you are looking to buy a Grampian or have one to sell in any...


Gear Info

Which Vintage Spring Reverb is Best?

We happened to have a stack of vintage spring reverbs all in one place so thought we'd put them all against each other & produce: The Soundgas...


Grampian Ambiophonic Unit – Type 666

Information about this rare piece of 60s gear: a version of the Type 636 designed to use the reverb "to alter apparent room acoustics" in auditoria.


Grampian Direct Signal Path (Wet-Only) Modification

Schematic, plus instructions reproduced into a searchable format from the original Grampian Type 636 Operating Instructions.


Grampian Type 636 Operating Instructions

Grampian Type 636 Operating Instructions & Technical Specification reproduced into a searchable format.


Grampian User Tips

Some useful info for using a Grampian 636 in a modern studio set up. By no means a full user guide, but this should help you...


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Lords Of The Springs – Tony’s Premier Guitar Article

My first piece for Premier Guitar on the subject of vintage spring reverbs, with particular emphasis on less-common units: definitely firmly in Soundgas territory. 


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