sE Electronics Gemini II Dual-Tube Cardioid Condenser Microphone

sE Electronics Gemini II: Dual-Tube Large-Diaphragm Condenser for Lush Vocal Warmth

The sE Electronics Gemini II is a large-diaphragm cardioid tube condenser microphone built around a genuine dual-valve circuit, using separate 12AX7 and 12AU7 tubes for its input and output stages. A hand-crafted 35 mm true-condenser capsule feeds this valve signal path to deliver the rich, warm, three-dimensional character that makes tube mics the classic choice for lead vocals. It ships with its own dedicated power supply, shock mount, cable, and case as a complete flagship system. For the vocalist or engineer chasing that lush, larger-than-life valve sound, the Gemini II is a genuine tube mic built to anchor a studio for years.

Genuine Dual-Tube Circuit: Separate 12AX7 and 12AU7 Valves

The Gemini II's signature is a true dual-tube design that dedicates a 12AX7 valve to the input stage and a 12AU7 valve to the output stage. A vacuum tube amplifies the capsule's signal by modulating a stream of electrons, and it naturally adds gentle even-order harmonics that the ear hears as warmth, richness, and body. Using two valves lets each stage be optimized independently, so the mic can deliver both high gain and a robust, low-impedance output with that valve character intact. This is a genuine tube microphone, and the dual-valve path is the source of its lush, saturated sound on voice.

Hand-Crafted 35 mm Large-Diaphragm True-Condenser Capsule

At the front of the signal path is a hand-crafted 35 mm gold/Mylar true-condenser capsule. A larger 35 mm diaphragm captures more low-frequency energy and adds weight and authority to a source, which is why oversized capsules are prized for flattering vocals. As a true condenser it is externally polarized for an open, detailed response, and hand-tuning keeps each capsule musical and consistent. Paired with the valve circuit, that big capsule gives the Gemini II its full, forward, larger-than-life voice.

Dedicated External Power Supply Included

The Gemini II requires and includes a dedicated external power supply that heats the tubes and provides the polarizing voltage, connected by a multi-pin mic-to-PSU cable. Tube mics cannot run on standard 48V phantom power because the valves need more current and a heater supply, so a purpose-built PSU is part of every genuine valve mic. The included supply means the mic works out of the box with no compatibility guesswork. Give the tubes a short warm-up and the Gemini II settles into its rich, stable tone.

Cardioid Pattern Voiced for Lead Vocals

The Gemini II is a fixed-cardioid microphone, most sensitive to the front and rejecting rear pickup. A cardioid pattern isolates a vocalist from room reflections and bleed, giving the dry, present, forward sound that lead vocals demand. Committing to a single pattern lets the capsule and circuit be optimized for the best possible on-axis vocal response. In an untreated room it minimizes room coloration, and in a treated booth it keeps the valve warmth focused squarely on the voice.

135-145 dB Max SPL With Switchable Pad and 150 Hz Filter

The Gemini II handles 135 dB SPL natively and up to 145 dB with its -10 dB pad, and offers a 150 Hz high-pass filter. Maximum SPL defines the loudest undistorted level, and this range lets the mic handle powerful vocalists and loud instruments without breaking up. The pad drops the level ahead of the valves so a belting singer never overloads the input, while the 150 Hz filter tames proximity-effect bass and rumble. Together they keep close, loud vocal performances clean and controlled.

35.48 mV/Pa Sensitivity and 200-Ohm Output for a Strong Signal

The Gemini II specifies a high 35.48 mV/Pa sensitivity and a 200-ohm output impedance from its power supply. High sensitivity means the mic delivers a strong signal that needs less preamp gain, which keeps the recording clean and lets the valve character come through rather than preamp noise. The 200-ohm balanced output drives standard mic inputs and long cable runs reliably. That efficient, robust output is part of why the Gemini II sits a vocal so effortlessly forward in a mix.

Warm Valve Character for Vocals, Voiceover and Acoustic Sources

With its dual-tube circuit and big capsule, the Gemini II is built for lead vocals, voiceover, acoustic instruments, and any source that benefits from warm tube coloration. The valve harmonics add a flattering density and smoothness that makes thin voices sound rich and full, while the heavyweight all-metal build signals its flagship intent. Reviewers prize it for its lush, warm dual-valve tone and its flagship-tier sound. For a first true tube mic or a signature vocal color to headline a locker, the Gemini II delivers a sound outboard processing cannot fake.