AMSynths AM8110 SN-101 VCO (2010–)
A hand-built Eurorack VCO that resurrects the SH-101’s raw, punchy oscillator in module form — right down to the LED sliders and AS3340A chip.
Overview
If you’ve ever craved the snappy, acid-ready bite of a Roland SH-101 but wanted it in your modular rack, the AMSynths AM8110 SN-101 VCO isn’t just a tribute — it’s a transplant. This isn’t some vague sonic homage with a retro paint job; it’s a deliberate, circuit-level resurrection of the SH-101’s oscillator, repackaged for Eurorack systems. Built around the same AS3340A oscillator chip that powered the original, it’s designed to deliver that unmistakable 101 character: tight, bright, and just a little brash. And while it doesn’t claim to improve on the original, it doesn’t need to — for many, that raw, unvarnished tone is the whole point.
AMSynths didn’t stop at the circuit. The front panel is a dead ringer for the SH-101’s minimalist layout, complete with those iconic LED sliders for pulse width and waveform mixing. It’s not just nostalgia bait — it’s functional homage. The sliders control the volume of the sawtooth, pulse, and sub (square wave) waveforms, blending them into a single output, just like the original synth did. There’s no digital trickery, no hidden menus, no polyphony — this is analog through and through, built for immediacy. You tweak, you patch, you get sound. Fast.
The module fits into the broader SN-101 Modular Project, a series of Eurorack modules aimed at reconstructing the SH-101’s voice one block at a time. The AM8110 is the starting point — the tone generator that defined thousands of basslines and leads in the '80s. It’s meant to pair seamlessly with other SN-101 modules like the VCF, VCA/ADSR, and LFO, letting you build a modular version of the 101 piece by piece. Whether you’re completing a full clone or just want that oscillator in your existing system, this is where the sound begins.
Specifications
| Manufacturer | AMSynths |
| Oscillator chip | AS3340A |
| Waveforms | Pulse, Sawtooth, Sub (square wave sub-oscillator) |
| Controls | LED sliders for Pulse Width, and Sawtooth, Pulse and Sub waveform volumes; switches for manual/external modulation sources, octave range, and octave of the square wave sub-oscillator; knobs for coarse and fine-tuning, and an attenuator over the FM Modulation input |
| CV Inputs | PWM, 1v/oct pitch input, Modulation |
| Outputs | A single out which contains a mix of the waveforms set by the sliders |
| Product type | Eurorack modular synthesizer oscillator module / VCO |
| Production years | The Eurorack module range was first introduced in 2010 |
Key Features
SH-101 DNA, Not Just Aesthetic
The AM8110 doesn’t just look like a piece of the SH-101 — it’s built to behave like one. The circuit is described as “very close” to the original, using the same AS3340A oscillator chip that gave the 101 its aggressive, cutting tone. That’s significant. While many modern clones use modern equivalents or digital emulations, AMSynths stuck with the real deal, adding only minor component upgrades for reliability. This isn’t about fixing what wasn’t broken; it’s about preserving the character that made the 101 a staple in techno, acid, and new wave. The result is a VCO that doesn’t just imitate — it integrates. Patch it into a modern system, and it doesn’t sound out of place; it sounds like it belongs.
Front Panel as Fingerprint
The layout is instantly familiar: LED sliders dominating the face, mimicking the SH-101’s hands-on interface. These aren’t just for show — they’re functional, letting you shape the mix of sawtooth, pulse, and sub-oscillator in real time. The pulse width slider doubles as a modulation target, with a dedicated PWM input and manual control. Octave switches let you jump between ranges, and the sub-oscillator’s octave can be set independently, just like on the original. It’s a design that prioritizes immediacy over complexity. No menus, no shift functions — just sliders, knobs, and switches you can tweak without thinking.
Built for the Rack, Protected for Reality
Despite its vintage soul, the AM8110 is built for modern Eurorack use. It comes in a 2mm thick aluminum panel, available in powder-coated or multi-coloured printed finishes, and includes M3x8mm mounting screws and washers. More importantly, it includes power supply protection fuses on the PCB — a small but critical detail for anyone who’s fried a module by plugging in a reversed power cable. It’s a quiet acknowledgment that while the circuit might be retro, the build standards aren’t. Every unit is hand-built and tested in Sussex, England, suggesting a level of care that mass-produced modules often lack.
Integration Over Isolation
This isn’t a standalone novelty. It’s designed to work within a larger ecosystem. The single mixed output simplifies patching, but the CV inputs — 1V/oct pitch, PWM, and modulation — make it fully voltage controllable. The FM modulation input even includes an attenuator, giving you control over how deeply external sources affect the pitch. And while it can stand alone, its real power emerges when paired with other SN-101 modules. Together, they form a modular recreation of the 101’s voice path, letting you rebuild one of the most iconic analog voices in modular format.
Historical Context
The AM8110 SN-101 VCO emerged as part of a broader trend: the modular resurrection of classic synths. Rather than cloning entire instruments, builders began extracting individual voice components and repackaging them for Eurorack. AMSynths entered this space in 2010 with its SN-101 Modular Project, aiming to capture the authenticity of the Roland SH-101 in discrete modules. The VCO was a natural starting point — the heart of the 101’s sound. At a time when Eurorack was expanding beyond esoteric experimental modules and embracing more musical, performance-oriented designs, the AM8110 offered a bridge between vintage character and modern flexibility.
Collectibility & Value
Priced at £160 as of October 2022, the AM8110 was positioned as a premium but accessible module — “undoubtedly reasonably priced” for a hand-built, UK-made recreation of a classic circuit. However, as of now, there are no retailers offering the product, and no classified ads for it on major marketplaces like Audiofanzine. This suggests it’s either out of production or released in limited drops, consistent with AMSynths’ model of small-batch releases announced via social media and email.
Owners benefit from a two-year warranty against product defects, and support materials — including user manuals and project notes — are available online. While there’s no public data on common failures or repair trends, the inclusion of power protection fuses hints at a design focused on durability in real-world use. Without a secondary market presence, current collectibility is hard to assess, but for SH-101 purists or modular builders seeking authentic 101 tone, this remains a niche but compelling piece.
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