CharterOak M900T Vacuum Tube Microphone  From CharterOak

The vacuum tube version of CharterOak's popular M900 small diaphragm condenser microphone.



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What We Think

The CharterOak m900t is quite an impressive tube pencil microphone. The m900t's frequency spectrum is incredible, providing a full bottom end, a detailed mid range, and a smooth high end that eliminates the harsh qualities found in other tube pencil mics. We found the m900t to shine on drum overheads and acoustic guitar, yielding a tone full of harmonic information yet still crisp and defined. 

CharterOak m900t Tube Pencil Mics - Drum Overheads Demo /video

Charter Oak microphones are used in this simple drum recording setup, including the m900t small diaphragm tube pencil mics as overheads, m900 with a solid state hyper cardioid capsule on snare, and the E700 dual diaphragm solid state condenser on kick drum. This simple setup allows you to hear the the clarity of each microphone. Each microphone is going through the Millennia HV-3R preamp and contains no EQ, compression, or reverb. The m900t's shine as overhead mics. They are very detailed, picking up a full bottom range with a smooth top end. The m900 mic with a hyper cap handles the ringy snare very well, remaining tight, isolated, and accurate. The E700 is a fantastic large diaphragm mic that handles the low end impressively. Check out our E700 kick drum video for more detailed information on this mic. If you have questions call us today at Sound Pure, and we would be happy to answer any questions you may have.

Manufacturer's Description from CharterOak

The CharterOak M900T small diaphragm condenser microphone is the vacuum tube version of our popular M900. It is excellent in situations where flat frequency response, excellent transient response, and robust and detailed sound are required.

The CharterOak M900T is a small diaphragm condenser microphone, which employs a vacuum tube head amplifier and Cinemag 2480 output transformer. The microphone utilizes modified versions of our S-5 (cardioid), S-6 (hyper-cardioid), and S-7 (omni-directional) capsule types. All three of these capsules are shipped with each M900T head amplifier, and are easily interchangeable. Sequentially numbered matched pairs are available for stereo recording. The M900T is equipped with a 15dB pad facility, and a 6dB per octave bass roll off at 75Hz. It is delivered in a hard locking flight case with a windsock, shock-mount, and custom power supply, and is guaranteed for life.

Appropriate uses for the CharterOak M900T are acoustic instruments, amplified guitars and bass, percussion, stringed instruments, piano, and ambient room recording etc.

The microphones are delivered with a lifetime warranty on all parts and labor and easy access to factory technical support.


About Manufacturer

CharterOak Acoustic Devices is quickly becoming an industry leader for professional quality recording products for today's musicians and audio engineers. Developed in 2002, CharterOak has independent offices in the US, Canada and the UK and is headquartered in the cozy suburbs of Connecticut. CharterOak was founded by producer/engineer, Michael Deming (Lily's, Pernice Brothers, Mike Ireland) from the need to obtain more control with his studio recordings. Our goal is not to emulate the classics of yesterday but to create the classics of tomorrow. Each CharterOak product is assembled & inspected by hand and tested in the studio before they ship to the customer. Sonic integrity, extreme durability, design simplicity, and serviceability are fundamental values upon which all CharterOak products are built. While our product line continues to grow and receive praise, CharterOak will continue to provide hi quality affordable recording device solutions.


Acoustical Operating Principle: Pressure Gradient

Diaphragm: 20mm

Frequency Response: 25Hz-20kHz

Sensitivity: -34dB (0dB=1V/Pa)

Polar Pattern: Interchangeable via modified S-5, S-6, and S-7 capsules.

Impedance: < 200 Ohms

Recommended Load: > 200 Ohms

Equivalent Input Noise: 13.5dB (A Weighted)

Maximum Sound Pressure Level: 138dB (1kHz at 138dB causes 0.5% Total Harmonic Distortion)

Power Requirements: Proprietary Power Supply

Power Supply Requirements: 115-230VAC