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Soundgas Type 636

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Page last updated Aug 10, 2025

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Description

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Limited production of these unique handbuilt rack reverb/distortion units, based on the classic Grampian Type 636 circuit. Bespoke redesign; hand-built featuring vintage and original components to faithfully replicate the authentic sound of the original but with improved low end, lower noise and mic pre direct out.

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Soundgas

King Tubby Big Knob (KTBK) Type 636 (Grampian) #dub #reggae #kingtubby #beats #soundgas #recording

Soundgas

Acid Gramps - Grampian 636, Space Echo, TR-808 & TB-303 DEMO

Soundgas

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Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Soundgas Type 636.

Features and functionality

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The preamp can be cranked separately for added fatness and distortion, adding unique character to the sound when integrated into a mix.
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The unit is capable of significant self-oscillation feedback, which offers a distinct, though potentially overwhelming, characteristic not commonly found in other reverb units.
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The unit features a 1/4" input and output, allowing it to be used in an amp FX loop, enhancing its utility with various setups.
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The inclusion of both aux and mic input options with specific impedance levels adds flexibility for different audio sources.
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Mods and upgrades

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Removing the spring unit and adding connectors to the chassis allows users to switch between different reverb spring units, enhancing versatility with springs sourced from inexpensive amps.
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Use cases and applications

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The mix of input jack sizes makes it particularly well-suited for integration with modular rigs, accommodating various equipment configurations.
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A user found the preamp coloration particularly beneficial for taming the cold, digital tone of a Hydrasynth, suggesting enhanced warmth and character.
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Reggae enthusiasts appreciate the Soundgas Type 636 for achieving classic dub reggae reverb sounds in an analog format.
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Comparisons

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The Soundgas Type 636 is considered a favorable replacement for the Alesis Microverb III by some users, indicating improved satisfaction with its sound quality.
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Value and pricing

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Priced at $199, it offers an affordable analog reverb option, appealing to users who find digital emulations lacking in authenticity.
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Artist usage

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Ed O'Brien

Guitarist, Singer

Radiohead

Verified via YouTube

In this June 2023 YouTube at 24:26 on the GigRig channel, Ed adds the 636 preamp to the pedalboard he’s constructing with Dan.

El-P

Rapper, Music Producer

Run the Jewels

Verified via Photo

Posted on his Instagram

Ben Frost

Guitarist, Composer

Verified via Photo

Frost can be seen using a 636 in this Instagram video. The fact that he's tagged Soundgas suggests that he's using the Soundgas remake of the 636, not the original Grampian.