Coil Audio builds a modular system of tube mic preamps around a single power chassis, the PS6 — instead of buying a separate power supply for every channel, you add modules to one shared source. The same circuits are also available as standalone units for anyone who does not need the full rack system.
Who it is for
- Studios scaling up channel by channel — one PS6 power supply runs up to six CA modules, so you start with one preamp and add more without investing in new power each time.
- Engineers choosing between an American and a European tube character — the CA-70 (6J7/6C5, US) and CA-286 (EF86, Europe) are two different circuit topologies in the same modular chassis.
- Anyone without a PS6 system — the standalone versions (CA-70S, CA-286S) put the same circuit in a single 2U chassis with its own power supply.
The line
- PS6 MK2 — 7U rack chassis with a separate 2U power supply, holds up to six CA modules.
- CA-70 / CA-70S MK2 — American two-stage tube circuit, 6J7/6C5, in modular and standalone form.
- CA-286 / CA-286S MK2 — European two-stage circuit on EF86 pentodes, in modular and standalone form.
- CP-448 — four-channel, linearly regulated 48V phantom supply built to work with older gear.
How the models differ
| Model | Circuit | Gain | Format | Price from |
|---|---|---|---|---|
| CP-448 | 48V phantom supply | — | 4 channels | €629 |
| PS6 MK2 | — (chassis + PSU) | — | 7U + 2U, up to 6 modules | €1,799 |
| CA-70 MK2 | 6J7/6C5, American | 42–54dB | module for PS6 | €2,399 |
| CA-70S MK2 | 6J7/6C5, American | 42–54dB | standalone 2U | €2,399 |
| CA-286 MK2 | EF86, European | 42–60dB | module for PS6 | €2,399 |
| CA-286S MK2 | EF86, European | 42–60dB | standalone 2U | €2,399 |
Which one to take
- Starting a system from scratch with room to grow — the PS6 MK2 plus one CA-70 or CA-286 module.
- American, direct character on vocals and guitars — the CA-70 MK2.
- European, denser midrange, more gain headroom on quiet sources — the CA-286 MK2.
- One channel without investing in the PS6 chassis — the CA-70S or CA-286S MK2.
- Old tube preamps that dislike modern switching supplies — the CP-448 with its slow-ramping 48V.
Why buy here
The full Coil Audio line is in stock. In our Warsaw showroom (Nowogrodzka 6A/102) you can compare the CA-70 and CA-286 character on the same source. Selected gear qualifies for our free 30-day Test-Drive, and everything ships with 36 months of warranty and a 30-day no-reason return window. We ship across Poland and to every EU country.
