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An introduction to United Studio Technologies UT Tube67, based on information from the maker and distributors: what it does, how to use it and who it may suit. It is not scored.
The UT Tube67 is a United's faithful homage to one of the most in-demand mic designs of all time.
— United Studio Technologies official site
What is UT Tube67?
The United Studio Technologies UT Tube67 is a large-diaphragm tube condenser microphone. United describes it as a faithful homage to classic microphones from the 1960s. It offers three polar patterns: cardioid, omni and figure-8.
It uses a 1960s NOS EF86 pentode vacuum tube. The capsule is a 34 mm brass dual-backplate K67-type with a 6-micron, 24k gold-sputtered Mylar diaphragm. United says it based the design on a 1970s capsule to give a natural low to low-mid range.
The transformer is a custom-wound, US-made UT-BV12. It uses high-nickel alloy laminations and a copper Faraday shield for reduced RFI. United also mentions a switchable Air Modification.
A power supply, shock mount, vintage-style pouch and a 6 m Sommer 7-conductor cable are included. Final assembly and testing are done in Baton Rouge, Louisiana, USA. United lists vocals, strings, woodwinds, brass, piano, drums and acoustic and electric guitars among the sources it suits.
NOS EF86 vacuum tube
It uses a 1960s EF86 pentode tube, which United credits for a warm, intimate vocal quality.
K67-type dual-backplate capsule
A 34 mm brass dual-backplate capsule with a 24k gold-sputtered diaphragm, intended by United for a smooth sound with little resonance.
Three polar patterns
Cardioid, omni and figure-8 let you adapt to solo, duet or room recording.
Air Modification
United describes a switchable air modification, a tool for adjusting high-frequency character.
80 Hz high-pass and -10 dB pad
Includes an 80 Hz high-pass (-12 dB point) and a -10 dB pad, with 137 dB max SPL at 0.5% THD.
Low-noise design
Self noise is below 11 dB, and United says extra effort went into reducing noise and RFI.
US-made transformer and assembly
The UT-BV12 transformer is US-made and final assembly and testing are in the USA.
Specifications
| Item | Details |
|---|---|
| Type | Tube condenser microphone |
| Capsule | UT Series, 34 mm brass, dual backplate K67 |
| Diaphragm | 6 micron, 24k gold-sputtered Mylar |
| Polar patterns | Cardioid, omni, figure-8 |
| Frequency response | 20 Hz – 20 kHz |
| Capsule sensitivity | -38 dB @ 60 V polarization |
| Max SPL | 137 dB @ 0.5% THD |
| Output impedance | 38 ohms |
| Tube | NOS selected EF86 pentode |
| Self noise | <11 dB |
| High-pass filter | 80 Hz (-12 dB point) |
| Pad | -10 dB |
| Power input | 110-120 VAC or 220-240 VAC, switchable |
| Mic dimensions | Height 241 mm x diameter 60 mm |
| Weight | Mic 0.85 kg / with shock mount 1.25 kg / power supply 1.3 kg |
| Cable | Sommer 7-conductor XLR, 6 m |
What is included and system requirements
- Shock mount
- Power supply
- Vintage-style pouch
- Custom interconnect cable (Sommer 7-conductor, 6 m)
- Microphone
How to use it
- Mount the mic in the shock mount and fix it to a stand.
- Connect the mic to the power supply with the dedicated cable.
- Check that the supply's voltage switch matches your region.
- Connect the power supply's XLR output to an interface mic input.
- Switch on the power supply and wait for the tube to warm up.
- Select pattern, low-cut, pad and Air Modification to suit the source.
- Raise the gain gradually and check the level while singing.
- Vary the distance during recording to compare tone.
Vocal tracking
United lists vocals first. It may suit those aiming for tube warmth.
Strings, woodwinds and piano
United says it also suits orchestral instruments.
Acoustic guitar
Try different patterns and distances.
Narration and podcasting
United lists broadcast use as well.
Who it may suit
- Those wanting to try a classic K67-style tube microphone
- Those who want one mic for vocals and instruments
- Those who want selectable polar patterns
- Those who prefer a US-made microphone
Good to know before you buy
- A dedicated power supply is required, needing space and power.
- At 1.25 kg with shock mount plus a 1.3 kg supply, it is fairly heavy.
- Stand or boom arm are sold separately.
How it differs from similar products
We do not pick a winner; the official figures are placed side by side.
RØDE K2
The Tube67 uses a 34 mm K67-type capsule and an EF86 tube, with 137 dB max SPL and under 11 dB self noise. The K2 uses a 1-inch diaphragm and a 6922 tube, with 162 dB max SPL and 10 dBA equivalent noise.
Price
$1,199 (United Studio Technologies official site, checked 2026-10-27). Prices can vary by region and promotion, so check the official page before buying.
See UT Tube67 on the product page
Sources: unitedstudiotech.com (checked 2026-10-27)
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