AMSynths 2500
A Eurorack module reviving ARP's rare 1005 filter and ring mod/VCA circuitry
Overview
Despite the name, the AMSynths 2500 isn't a full synthesizer. It's a Eurorack filter module inspired by the ARP 2500 system. Specifically, it resurrects the ARP 1005, a rare module mentioned in brochures but seldom seen. AMSynths rebuilt it for modern modular rigs, combining the original's circuit topology with modern components like WIMA capacitors.
Specifications
| Product type | Eurorack filter module |
| Filter type | 12dB/octave bandpass |
| Component detail | modern precision and lush WIMA caps |
| Filter configuration | Eight fixed bandpass filters spaced an octave apart |
| Module Width | 12 HP |
| Form Factor | Eurorack |
| Synthesis Type | Analog |
| Features | Retain both the Ring Modulator and VCA; Level pots |
| VCA modes | Linear and exponential mode |
| Original price | £295 GBP |
Design
The AMSynths 2500 is a re-imaging of the four-quadrant multiplier and VCA from the ARP 1005 module, rebuilt with fat traces and modern reliability while preserving the original's sonic character. It uses a standard ARP transistor in the VCA and aims to replicate the analog warmth of the 1970s design. AMSynths calls it a "faithful, fat-trace reincarnation."
Context
The ARP 1005 was never a star of the ARP 2500 system. It was referenced in brochures but rarely encountered. The big, patch-cord-heavy ARP 2500 was shaped by artists like Stevie Wonder and Wendy Carlos, but its 1005 module stayed obscure. AMSynths' revival brings it back for modern modular synthesis.
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