United Studio Technologies UT Tube67 Large Diaphragm Tube Condenser Microphone

Silky-smooth tube sound. The UT Tube67 is a United’s faithful homage to one of the most in-demand mic designs of all time. The original classics have shaped the sound of countless classic recordings since their debut 1960; renowned for velvety, creamy, full-bodied tone. The UT Tube67’s smooth top end makes it an outstanding choice for vocals, imparting a warm, intimate quality that can only be delivered by its 1960s NOS EF86 pentode vacuum tube. Linear response across polar patterns ensures versatility, excelling in capturing strings, woodwinds, brass, piano, drums, and both acoustic and electric guitars.

United has taken this classic-specification design to the next level with component-level attention to detail, as well as including a switchable Air modification preferred by many classic recordists.

A custom United UT K67 capsule.

The UT Tube67’s capsule is a custom-made, historically correct dual backplate/diaphragm capsule; skinned in a laboratory clean-room environment and 24k gold-sputtered on 6 micron Mylar. It has been optimized for the microphone’s operating voltage, and tuned to its ancestors’ specification, resulting in a smooth sound without the resonance that is found on most modern reproductions. The difference in comparison to other reproductions is unmistakable.United based its design on a 1970s-made capsule that we found to be the best we had ever heard — providing a littlemore natural low to low-mid range frequency when compared to other specimens.

Custom United transformers.

The custom-wound, US-made, UT-BV12 transformer is wound to our own specifications and set to the same laminations historically used on the original. Careful measurements were made from a golden specimen of the original transformer to ensure the UT Tube67 delivers the same legendary, tight bass response.United used all high-nickel alloy laminations and employed a copper Faraday shield for reduced Radio Frequency Interference (RFI). While they could have used a smaller or less expensive transformer, United’s design team refuses to compromise.

It’s not just another mic — it’s a United.

The UT Tube67 is a personal homage to one of United's favorite classic mics that they felt has not gotten the proper respect it deserves. United has gone the extra mile to reduce noise and RFI, and to ensure that the UT Tube67 provides boutique-quality sound that’s built to last.

From the custom-made Sommer Octave 7-pin cable to the regulated power supply; to all final assembly and testing conducted in the USA at United’s base of operations, they have left no stone unturned in the pursuit of the highest level of audio quality.

The UT Tube67 is an exceptional microphone to grab for almost any application.

Features

• Faithful reproduction of the venerable 67-style German tube microphones
• A vastly superior reproduction compared to others on the marketplace·Uses a NOS (New Old Stock) 1960s EF86 pentode vacuum tube
• Custom United 24k gold sputtered dual diaphragm/dual backplate K48 style capsule — based off of a superior one-of-a-kind golden sample from the 1970s
• Custom wound, American-made United transformer
• Switchable Air Mod gives a subtle top end lift, as well as clearing up transient peaks in the high frequency spectrum.
• Absolute workhorse, a desert-island microphone for professional studios, demanding musicians, and voiceover artists
• Silky-smooth top end that’s considered “unmatched by other microphones”
• Includes high-performance power supply, custom
• Sommer (Germany) Octave 7 conductor cable, vintage-style storage pouch and shockmount

Specs

Type:                            Condenser Microphone
Diaphragm:                  6 micron, 24k gold sputtered Mylar (PET film)
Capsule:                       UT Series, 34 mm brass, dual backplate K67
Frequency response:  20 Hz - 20 kHz
SPL:                              137dB @ 0.5% THD
Polar Pattern:               Cardioid, Omni, Figure-of-8
Output Impedance:      38 Ω
Output Connector:       24k gold plated 3 pin XLR, pin 2 HOT, pin 1 GND from Power Supply
Amplifier Type:             Vacuum tube
Tube:                             NOS selected EF86 pentode vacuum tube
Self Noise:                    <11 dB
Output:                         Custom-wound UT Series transformer, made in USA
High Pass Filter:           80 Hz (-12dB down point)
Pad:                               -10dB
Body:                             Nickel electroplated / black satin paint, solid milled brass
Mount:                           Suspension type shock mount (included)
Interconnect:                Custom Sommer 7 conductor XLR cable 6 m / 19.7’
Power Connector:        IEC320 3-conductor receptacle
Power Input:                 110-120 vAC or 220-240 vAC; switch selectable

Dimensions 

Microphone:             Height: 244 mm / 9.6″, Diameter: 60 mm / 2.375″,

Shockmount Depth: 119 mm / 4.69″ - 183 mm / 7.2″
Power Supply:           Height (w feet): 67 mm / 2.63″, Height (w/o feet): 60 mm / 2.36″, Width: 143mm / 5.6″, Depth:                        171 mm / 6.75″