Doepfer A-143-9
Professional music gear - detailed information and where to buy
Doepfer
A-143-9
Product Info
* Prices may vary. Check retailer for current pricing and availability.
The A-143-9 is a classic for a reason. Its quadrature output is a huge asset for creating stereo movement and complex rhythmic patterns, and its compact size makes it a great addition to almost any Eurorack setup. It's ideal for those wanting a solid, reliable, and affordable core LFO for modulation duties.
Product Description
- Doepfer A-143-9
- Quadrature LFO / VCO
- Can simultaneously produce sine and cosine signals
- 4 Outputs that are phase shifted by 90 degrees
- Eurorack format
- Width: 8 HP
- Depth: 50 mm
- Power requirement: +30 mA (+ 12V) / - 30 mA (-12V)
PROS
- • Excellent quadrature phase shifting for complex modulation
- • Compact 8HP footprint maximizes rack space efficiency
- • Robust Doepfer build quality ensures long-term reliability
- • Sine/cosine outputs offer versatile waveform shaping possibilities
CONS
- • Limited waveform selection compared to more modern LFOs
- • Power draw, while manageable, can add up in large modular systems
- • The lack of attenuators can make precise modulation tricky
Product Video
Key Features
Waveforms
Sine, Cosine, Quadrature
Rate Range
Sub-audible to approximately 10Hz
HP Width
8
Depth
50 mm
Power Draw
+30 mA / -30 mA
Outputs
4 (90-degree phase shifted)
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Frequently Asked Questions
Quadrature provides true 90-degree phase shifts, resulting in a more mathematically pure and predictable modulation than simply offsetting two oscillators.
Yes, they can function as VCOs, but the limited frequency range and lack of wave shaping options make it better suited for slow, evolving tones rather than traditional melodies.
Absolutely, it's a great starting point for understanding modulation, but the lack of attenuators means you'll need to learn about level control quickly.
