The UT Twin87 offers the authentic sonic capabilities of both “87-style” microphones in one package. United extensively measured component values and types, and circuit differences between ‘golden reference’ specimens of the very earliest available microphones of this style, as well as some of the final revisions produced. These variations were studied, documented, and their audible differences were carefully teased out. No mere ‘EQ/boost’ circuit or digital gimmick would cut it — the UT Twin87 literally toggles between two discrete ‘87 style circuit topologies, separated by nearly half a century.

In Vintage mode, the UT Twin87 polarizes its capsule directly by phantom power voltages, taking advantage of an insulated, dual backplate capsule design — just as the earliest "87-style" microphones did. The high-Z and de-emphasis circuitry use all of the same component choices as the original. This yields a slightly warmer, softer and forgiving sound. 

In Modern mode, the capsule is polarized at a higher voltage using an FET oscillator circuit as found on later revisions of the classic mic, yielding a higher capsule sensitivity and feeding a hotter signal into the amplifier circuitry. Its high-Z and de-emphasis circuitry likewise use all of the same component choices as much later “87-style” designs. This yields a louder, slightly brighter and more articulate response, with an extended top end reach and a more ‘up-front’ character. 

Specifications
Type 
Condenser Microphone 
 
Capsule 
UT Series, 34mm brass, insulated dual backplate K87
 
Diaphragm 
Dual-diaphragm, 6 micron, 24k gold sputtered Mylar (PET film)
 
Power Supply 
+48v Phantom Power (via XLR)Ground 
Pin 1 XLR (required) 
 
Frequency Response 
20 Hz - 20 kHz 
 
Polar Pattern 
Cardioid, Figure 8, Omni
 
SPL 
136 dB (145 dB w/ Pad) @ <.5% THD
 
Output Impedance 
27 Ω
 
Amplifier Type 
Field Effect Transistor
 
Self Noise 
<10 dB (cardioid setting, no pad, no HPF)
 
Output 
Custom-wound UT Series transformer, made in USA
 
Body 
Nickel electroplated, solid milled brass

High pass filter 
80hZ (12dB down point)
 
Pad 
-10dB
 
Connector 
24k gold plated XLR, pin 2 HOT, pin 1 GND
 
Mount 
Suspension type shock mount (coming soon)
 
Dimensions

Height: 220mm / 8.6 in.
Diameter: 55mm / 2.2 in.
Shockmount Depth: 190mm / 7.5 in.

Technical Specifications:

Link: 
https://unitedstudiotech.com/en/products/ut-twin87