Coil Audio Single Channel CA-286 PS6 Modular Mic/Line Amp

Two-stage amplifier with flexible input pad network, negative feedback tone shaping, and inter-stage volume control
MFR# PS2 CA-286
Coil Audio Single Channel CA-286 PS6 Modular Mic/Line Amp
Coil Audio Single Channel CA-286 PS6 Modular Mic/Line Amp video
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The Coil Audio CA-286 is a two-stage amplifier based on circuits used by Langevin, Collins, Gates, and Telefunken during the 1950s and 60s. Each amplifier uses Coil's 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.

The PS-6 version is a fully removable module for use with the 6 channel PS-6 Rack Tray. Each amplifier is easily removable via two thumb screws for flexibility, expandability, and transformer substitution.


  • 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.


  • Two-stage EF86/6267 pentode vacuum tube-based circuit
  • 42 - 60 db of available gain
  • Flexible input pad section for mic or line level operation
  • Transformer balanced. 150 Ohm or 10k input, 600 Ohm output
  • Interchangeable/Optional input and output transformers
  • NOS tubes, signal caps & resistors, PEC 2W carbon pots
  • Hand Built and Tested in the USA

Additional Information

Condition New
Channels 6-Channel
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