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Mods for the CV-12

  • Microphone PartsMicrophone Parts
    The “V-251” circuit kit for the Avantone CV-12 replaces 100% of the circuit with selected, high-grade parts. It replaces the mic’s CCDA (two-stage triode) circuit with a near-clone of the original Telefunken ElaM 251 single triode circuit. The tube is a selected low-noise 6072; the output transformer is a Cinemag T14 style. Input and output capacitors are US-made film and foil designs.

9 polar patternsAvantone Pro CV-12

Multi-Pattern Tube Condenser Microphone

The CV-12 is a multipattern large-diaphragm tube mic in the physical style of the AKG C-12.

CV-12This mic’s capsule has likely changed during the course of its production. Reports from users who have opened them up universally indicate that the mic uses a standard Chinese-made 32mm K67 capsule, as pictured at right. Nonetheless, it is possible that recent production runs have begun incorporating a 34mm edge-terminated capsule.

A rotary switch on the external power supply provides 9 pickup patterns — Omni, Cardioid, Figure-8, and six intermediate patterns.

The amplifier circuit is built with high-quality through-hole components. Although in its earliest revisions this mic was a component-for-component clone of the Apex 460 and equivalents, current shipping models use upgraded components such as metallized polypropylene capacitors in the audio path.

The output circuit uses a transformer.

The single supplied tube is a 6072A dual-triode, sourced from Russia.

The CV-12 ships in a padded wooden box, and includes a suspension shockmount, dedicated power supply, power cable, and aluminum flightcase. The mic carries a 5-year warranty.

Until early 2009, Avant included two spare tubes with the microphone, enabling users to swap tubes to achieve different sounds. The three included tubes were all of Russian origin: 6072A, ECC81 & ECC83. The Avant website contained detailed tube-swap instructions, which stated:

Avant Electronics

Avant Electronics feels that the 6072a tube that is installed in the microphone is the best balanced tube by far for the majority of work with the CV-12, but we have provided two additional tubes, the ECC81 and ECC83 for different tube “voicings”.

Starting with the 6072a tube each tube has an increasingly “hotter” output, thus distorting the transformer sooner. Many of you might never require these tubes but if you require an unconditionally aggressive, distorted vocal track or have an exceptionally mellow female vocalist; then you might find them useful.


  • 6072A Tube : Smoothest of the lot, balanced warm character, very revealing on vocals
  • EEC81 Tube : Brighter response, accentuates the sizzle and the sheen
  • EEC83 Tube: Almost “gritty” character, veers into classic tube distortion territory

Like all Avant mics, the CV-12 is individually tested by Avant staff in California prior to shipment.

Electronic Musician, 2009

I used the CV-12 in subcardioid mode … for up to 10 [vocal] overdubs at once. Cumulative layering can exaggerate deficiencies or bumps in a microphone’s response, but I was very pleased at how the Avantone didn’t pile on undesirable components of the vocal sound or room tone. This real-world application was a convincing demonstration of the CV-12’s unhyped tone on vocals.

Barry Rudolph

In the studio I found the CV-12 wonderfully warm and fat sounding.

The Avantone Pro CV-12 is also known as: CV12.


Frequency Response - OmnidirectionalClick Graph to Compare!
CV-12 Omnidirectional Frequency Response Chart
Frequency Response - CardioidClick Graph to Compare!
CV-12 Cardioid Frequency Response Chart
Frequency Response - BidirectionalClick Graph to Compare!
CV-12 Bidirectional Frequency Response Chart
Pickup Patterns Pads & Filters
Omnidirectional (17.8 mV/Pa; 25 - 20,000 Hz)
Cardioid (17.8 mV/Pa; 25 - 20,000 Hz)
Bidirectional (17.8 mV/Pa; 25 - 20,000 Hz)
  • Pad: -10dB (Via Switch)
  • Filter: HPF: -6dB/oct @ 80 Hz (Via Switch)
Capsule Dimensions Impedance SPL/Noise
Diaphragm diameter: 32mm
250 Ohms (Low) Max SPL: 146 dB
Self-noise: 17.0 dB(A)
Weight Length Max Diameter Interface(s)
800g (28.22oz) 237mm (9.33'') 46mm (1.81'')
  • 3-pin XLR male (1)
Power Specifications
  • Includes tube power supply

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