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Description
Modular Microphone/Line Tube Amplifier The CA-70 preamplifier module pays homage to the classic American two-stage circuit invented by Western Electric™ in 1913 and manufactured by multiple companys from the 1930's through the 1950's – most notably RCA™, Gates™, and Langevin™. This old octal tube circuit has a huge thick tone and is what many consider to be the quintessential “old tube preamp” sound.
The CA-70 PS6 preamp module uses our own Coil Audio transformers, high quality capacitors, resistors, and NOS octal tubes. It's powered by our PS6 Rack Tray and Power Supply.
$1,899.00
The Controls The (INPUT) pad section contains a phase reverse switch, and a 6 position pad network. The first four positions are various 150/250 ohm mic pads; -6db, -12db, and -19db. The final two (LN 1 & LN 2) positions allow line-level signal to run through the amplifier providing tone-shaping capabilities while mixing from your DAW, Tape Machine, or other Line Level Devices – including other Preamps.
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. Clockwise increases negative feedback, producing a darker tone with a smooth, dampened harmonic structure.
The (HIGH) 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 is placed between the 1st stage 6J7 and 2nd stage 6C5 tubes and sets the final level Output level.
Videos
Sound On Sound magazine
Coil Audio CA-70 - Summer NAMM 2016
Coil Audio CA-70 - Summer NAMM 2016
Sound On Sound magazine
Coil Audio CA-70 Microphone Preamp/Line Amp - Gearslutz @ Summer NAMM 2016
Gearspace Forum
Reviews
Owner Insights
We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Coil Audio CA-70.
Features and functionality
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The CA-70 preamp effect varies with negative feedback adjustments; clockwise increases warmth and reduces treble, enhancing low-end presence.
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Use cases and applications
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Owners find the CA-70 particularly effective on kick, snare, and bass tracks for a pronounced low-end boost.
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User experience
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Users suggest applying multiple instances in series to clearly perceive the preamp's tonal impact, especially for enhancing low-end richness.
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Based on 0 Reviews and 0 Ratings
Artist usage
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James Petralli of White Denim used Coil Audio CA-70 preamps in the recording of their 2019 album, Side Effects. This information is confirmed by sound engineer Jim Vollentine, co-owner of Coil Audio In a detailed post on the Gearspace forum, Vollentine, who was intimately involved in the album's creation at Radio Milk studio, included the Coil Audio CA-70 among the list of recording equipment employed for Side Effects.
In the video titled "EPIC HOME STUDIO Setup 2024 | Ryan Petersen (studio tour)" by Andrew Masters on YouTube, at the 9:39 mark, a pair of Coil Audio CA-70 modular microphone/line amplifiers are visibly installed in a rack within Ryan Petersen's home studio.
Matt Bayles, a music producer known for his work in alternative rock and indie genres, has confirmed on his official website dedicated to his mixing studio, the Red Room, that he employs two Coil Audio CA-70 preamps in his studio setup. This information is directly credited to Matt Bayles' own overview of equipment he utilizes for production.
Album Usage
The Coil Audio CA-70 has been featured on the following albums:
Genre Usage
Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.
Used With
Based on how musicians on Equipboard use Coil Audio CA-70, it is most commonly used with the following gear.
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