Coil Audio CA-70
Modular tube mic/line preamp
Preamp$1,899Manufacturer list price
Specifications
- Type
- Preamp
- Description
- Modular tube mic/line preamp
- Topology
- tube/valve, transformer-coupled
- Signal path
- Analog
- Channels
- 1
- Channel format
- mono
- Form factor
- PS6 rack module — requires separately purchased PS6 Rack Tray (7U, holds up to 6 modules) and PS6 Power Supply (2U) to operate
- Powered
- true
- Impedance (Ω)
- 150 (mic in) / 20000 (line in) / 600 (out)
- Country of manufacture
- USA (Lawrence, Kansas)
Details
Controls: Input pad (mic/line), gain (42-54dB), negative-feedback tone control with high/low filters
I/O: Mic/line input with flexible input pad, XLR I/O via PS6 rack tray (Neutrik XLR connectors, military-grade Cinch Jones module-to-tray connectors)
Notes: Two-stage 6J7/6C5 tube circuit, homage to 1913 Western Electric two-stage design (later made by RCA/Gates/Langevin). $1,899 is per-module price only; the PS6 Rack Tray and PS6 Power Supply needed to power it are not sold as separate line-item SKUs with published prices on the site, so total system cost is unclear — flagged, not guessed. Channel count of 1 is inferred (not explicitly stated) from the fact that up to 6 modules mount per PS6 rack and the CA-70S is described as a single-channel standalone version of this same module. Phantom power is not mentioned on the product page; Coil sells a separate outboard CP-448 4-channel phantom supply, which may imply external phantom is expected, but this is not confirmed on the CA-70 page itself. No frequency response, dimensions/weight, year of introduction, or notable-use credits are published on the site.