Soundgas Type 636 (Grampian) Spring Reverb - Preorder

Preorder - limited initial production of approximately 20 unique handbuilt rackmount units. Bespoke redesign; handbuilt featuring vintage and original components to faithfully replicate the authentic sound of the original.

PRICE: £2,650.00 EX VAT (£3,180.00 INC VAT)



The Soundgas Type 636 brings the hallowed Grampian Type 636 Spring Reverb design into the 21st century; an authentic future studio classic.

Handbuilt in limited numbers from vintage parts, this unit features all the hairy sonic goodness of the originals in a convenient and reliable rackmount unit.

Note – product image is a close up of a vintage machine. Images of the new unit will be released soon – the rackmount design will feature a front panel closely based on the look and layout of the original.


SECOND TIER NOW SELLING – The First 10 units have been pre-ordered and this listing is now for one of the second batch of 10. These will have a longer lead time than the first batch and we expect them to be shipping in late October/November this year. See below for full preorder information.

The Soundgas Type 636 Spring Reverb brings the hallowed Grampian Type 636 into the 21st century. Whether you seek the ultimate dub reverb, the meatiest distortion, or achingly beautiful organic textures, the Type 636 has it by the truckload.

These units will be hand-built to order in very limited numbers using many vintage parts for an authentic sound.

The design is as faithful to the original as possible and delivers all the hairy sonic joy of the originals. Dr Huw’s 21st century re-imagining does not mean corners cut – far from it – the attention to detail evokes a bygone era when gear was hand-built with care. The circuit boards have been lovingly crafted and deliver all the wild tones and textures with none of the extraneous noise and hiss of a neglected original. Wherever possible, we are using period correct parts for absolute authenticity.

The Soundgas Type 636 is a Grampian with less noise and greater reliability, designed with the benefit of hindsight and decades of experience with the originals. We’ve taken the best from various eras of 636s and brought them together with a studio sensibility – accentuating exactly the flaws and foibles of the design that are so beloved of today’s users. Individual Grampian 636s all have unique sonic signatures due to age and construction and each hand-built Soundgas Type 636 will be a unique piece. We keep two Grampians in the Soundgas Studio because they have quite distinct characters (one has an original Gibbs tank, the other a later Accutronics tank, but the circuit designs are quite different also).

A true studio classic designed and built with love and attention to detail for today’s musicians and producers.


Initial production will be limited to around 20 bespoke rackmount devices sold in an initial batch of 10, followed by a further batch (UPDATE: first 10 are now sold). While the basic design is complete, we are still developing extra modifications and features: preorder customers may receive additional upgrades and extra options (to be confirmed).  The investment of time and resources involved in the genesis of this project has been significant; we may offer the option of placing a deposit for later orders, but precedence for the initial run will be given to those who support the build and are willing to make payment in advance.

Delivery times will be confirmed after ordering – we intend to begin delivery of serial number 01 in late September and expect later units to ship through to October/November 2019. Serial numbers will be allocated on preorder sequentially. If at any time you wish to cancel your preorder, please advise us by email and we’ll issue a full refund and allocate the machine to the first customer on the waiting list.


Brand new!


For sales in UK/EU the price will include 20% VAT. VAT-free sales are possible to businesses and individuals in the EU (outside the UK) with a valid VAT Number - please get in touch if you wish to buy this way.

Voltage Information

Switchable voltage for use anywhere in the world - it will be set up ready for you to use before we ship.

Video Demos

Demos featuring our fully operational test unit (complete except for the faceplate), plus some earlier initial test-firings of the prototype (built into an old Binson face-plate!). The production unit will not look like this and will feature an all-new panel in the style of the original.


For much more detail about the Grampian Type 636 – history, original documentation and schematics head to our main Grampian page now.


Soundgas Type 636 (Grampian) Spring Reverb – Preorder

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(Re)Building the Ark

We now have the first working prototype of what will be known as the Soundgas Type 636. A faithful recreation/re-imagining of the original Grampian Type 636,...

PUBLISHED: 24th Apr 2019

Soundgas Type 636 (Grampian) Spring Reverb – Preorder

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Soundgas Type 636 (Grampian) Spring Reverb – Preorder



Grampian 636 Instructions & Schematics

Directory of original Grampian documentation we have, including tech specs, schematics and articles, to view and download.

Soundgas Type 636 (Grampian) Spring Reverb – Preorder


Grampian Type 636 Operating Instructions

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


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Tom Gossin


Soundgas Type 636 Update


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Soundgas Type 636 Update

Here’s a quick update for all who’ve placed preorders for the Soundgas Type 636.

PUBLISHED: 26th Jun 2019

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