Next build June 2024: Pre-order now! Desktop version our Grampian 636 mic preamp circuit: no corners cut, all the ragged filthy glory of the Type 636 mic preamp in a handy portable unit.
Desktop version of our Soundgas Type 636: no corners cut, all the ragged filthy glory of the Grampian/Soundgas 636 mic preamp in a handy portable unit.
Next batch ready end of April: Pre-order now – they don’t stick around for long, best get in quick!…
If you want a footswitch/guitar pedal version please see this listing.
As seen/heard on the pedalboards of Mason Stoops, Ben Frost, Ed O’Brien and many more…
Also available with a toggle switch for desktop use.
What is it? This is the hairy circuit you find in the mic preamp section of the Soundgas Type 636 – based on the Grampian Type 636 – famously used and abused by Lee Scratch Perry and Pete Townshend – and many others since. This is designed and built absolutely in the spirit of the original vintage units – no surface mount components or tone sapping DSP.
How is this version different to the Prototypes? Photos are of the latest version. Based on feedback and our own testing of the original units, we have moved the input and output sockets to the rear of the box and added a three position attenuation switch on the output. This to tame the massive amount of gain produced when dialling in maximum overdrive/filth: now you can have all the dirt without overloading your amp/ears/signal chain. We have kept the industrial/functional aesthetic of the prototypes with a raw casing and just the footswitch, light and knob on the top.
More information:
The unit features a balanced input via combined TRS/XLR socket, vintage germanium transistor circuitry with original Grampian specification Mic transformer, overload lamp, input impedance switch, output 3-way attenuator switch and on/off toggle footswitch. Staying true to the original Grampian 636 design, the output is unbalanced on a ¼” jack socket and is out of phase.
Power is via a 12v external supply (included)
As with our original 636s, we have put tonal considerations ahead of all else. I was skeptical that we’d see a real benefit in using germanium transistors in the buffer section: all our original prototypes had used silicon and sounded great. However Dr Huw insisted that we build an all germanium version for comparison which proceeded to blow all the earlier versions out of the water.
There’s more info on the original build including photos and demos here.
Brand new item.
See description for more information.
For sales in UK the price will include 20% VAT. Buyers elsewhere may incur VAT or other local taxes on import.
Please note: the demos below mostly feature various prototypes. The design and build the units we are now selling differs slightly – see the photos for the current layout. In addition some demos feature units with the earlier silicon buffer board which don’t sound as good as the final all-germanium design.
Say hello to the prototype Type 636P: all the heft and magic of the our 636 mic preamp in a compact desktop box.
PUBLISHED: 10th Aug 2021
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...
PUBLISHED: 30th Jun 2016
Video from the Q&A session we did on the Grampian and Soundgas Type 636 units, plus an update on the Soundgas 636 build. Also Jane Weaver!
PUBLISHED: 29th Oct 2019
The one page manual that comes with our Type 636P germanium preamp - our zero-compromise recreation of the legendary Grampian mic preamp circuit.
Directory of original Grampian documentation we have, including tech specs, schematics and articles, to view and download.
Grampian Type 636 Operating Instructions & Technical Specification reproduced into a searchable format.
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