The Coil Audio CA-286 MK2 Preamp is a two-stage amplifier based on circuits used by Langevin, Collins, Gates, and Telefunken during the 1950s and 60s. Each amplifier uses our own custom interchangeable transformers, NOS capacitors and resistors, and a pair of NOS EF86 vacuum tubes.
With the addition of a flexible input pad network, the Negative Feedback tone shaping, and inter-stage volume control, the CA-286 is a timeless and flexible amplifier that compliments any microphone collection. You must have the Coil Audio PS6 Rack to power the Coil Audio CA-70 Preamp.
Coil Audio CA-286 MK2 Preamp Controls
- The (INPUT) pad section contains a phase reverse switch, and a 5 position attenuation network of Balanced H-pads. The first four positions are various 150/250 Ohm mic pads; -6 db, -12 db, and -19 db. The final (LN) position allows line-level signals to run through the amplifier providing tone-shaping capabilities while mixing. It works as both a second-stage booster for other preamps, and a summing/buss amp for program and mix material. Two amplifiers can also be chained together to create the multi-stage, high gain recording path of a vintage tube console.
- The NF, HI, and LOW controls all interact to create a unique tone-shaping circuit. The NF control varies the amount of Negative Feedback present in the circuit. Counter-clockwise brightens and moves the sound forward while raising harmonics and sensitivity. Turning it clockwise increases negative feedback, producing a darker tone with a smooth, dampened harmonic structure.
- The HI switch transitions from the natural openness of the tubes, to a gentle filtering of upper frequencies. The LOW switch reacts with the NF, boosting or cutting low frequency while moving the low end from front to back in the sound stage.
- The Output control knob is placed between the 1st and 2nd stage EF86 tubes. It sets the final level and offers further control of the two-stage gain structure.
Coil Audio CA-286 MK2 Preamp Features
- 16 ga. Stainless Steel Module with Integrated XLR I/O
- Coil Audio CT-110HN high nickel input and CT-41 output transformers installed.
- 12-Step Switched Negative feedback tone control with LOW/HIGH filters.
- Two-stage Dual EF86 vacuum tube single ended parafeed circuit.
- 42db-54db of available gain.
- 150 Ohm and 2k Mic input, 20k Line input, 600 Ohm output.
- 4 Position PAD for both Mic and Line Input.
- True 180-degree Phase Switch
- Up to 6 PS6 MK2 Series Modules mount into 7U PS6 Rack Tray.
- Hand Built and Tested in the USA
Coil Audio CA-286 MK2 Preamp Includes
- Coil Audio CA-286 MK2 Preamp
- Manufacturer Warranty
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