Customized U67 Electronic Tube Microphone 

I. Product Overview 

Customized U67 recreates the classic 1960s legendary recording studio tube microphone. It is based on the acoustic architecture of the original Neumann U67, using our self-developed K67 dual-diaphragm pickup + selected EF86 vacuum tubes to reproduce the warm and retro analog sound of the golden age. It can be used for recording in various scenarios such as vocals, instruments, and live ensemble performances. It is a flagship-grade large-diaphragm tube microphone for professional recording studios, independent musicians, podcast dubbing, and live singing. The entire machine is crafted with high-quality metal, equipped with an independent power supply and shock-absorbing stand, ensuring both the retro appearance and professional recording performance. It offers high value for money as an alternative to classic equipment priced at tens of thousands of yuan. 

II. Core Hardware Advantages 

1. Classic K67 Gold-plated Dual Diaphragm Driver

34mm brass dual backplate structure, 6-micron 24K gold-coated polyester diaphragm, calibrated in a dust-free workshop, with a frequency response ranging from 20Hz to 20kHz, covering the entire range of human auditory perception; the low frequencies are rich and solid without being muddy, the mid-frequencies are three-dimensional and transparent, the high frequencies are smooth without harsh clicks, and the near-field recording perfectly cancels out the near-sitting effect.

2. EF86 Vacuum Tube Circuit

Select original factory electronic pentodes with low noise, combined with custom balanced output transformers, featuring soft and natural harmonic coloring, reducing the coldness of digital recording, the human voice has a rich atmosphere, the high and low frequencies have clear separation of layers, the noise is as low as 17dB(A weighted), and there is no interference from background noise in a quiet environment.

3. Three-directional Switchable Design

Switch between three pickup modes with one button: cardioid, omnidirectional, and 8-shaped: 

- Heart-shaped: Solo vocal performance, live broadcast, voice-over, acoustic guitar

- Omnidirectional: Chorus, orchestra, ambient space sound recording

- Eight-shaped: Duets, stereo dual-microphone recording, interview recording 

4. Practical Function Switch 

- 10dB attenuation Pad: Designed for high-volume sound sources such as drum kits and electric guitar amplifiers, it can withstand a maximum sound pressure level of 124dB SPL, preventing distortion and cracking.

- 100Hz high-pass filter and low-cut: Filters out air conditioning noise, floor vibrations, and low-frequency environmental noises, optimizing the problem of excessive low-frequency bloating when singing close to the source. 

5. Independent wide-voltage regulated power supply

An external 7-pin dedicated power supply box, supporting global wide-voltage adaptation from 110V to 240V, suitable for mains power in countries such as Europe, Southeast Asia, and South America; the circuit has voltage regulation and filtering, eliminating low-level current noise. It is paired with 3-meter 5-pin dedicated shielded cable for lossless signal transmission over long distances.

6. All-metal durable body

An matte nickel alloy integrated body with a conical retro mesh head, resistant to wear and corrosion; it comes with a spider-web-shaped metal shock-absorbing frame to isolate the vibration of the support and the transmission of noise from the desktop, reducing the workload for later noise reduction. 

III. Applicable Scenarios 

✅ Professional recording studio: Recording of pop vocals, bel canto, folk, rock lead vocals

✅ Instrument recording: Piano, violin, acoustic guitar, brass instruments, drum kit overhead

✅ Self-media content: Audio books, radio dramas, podcasts, video game voiceovers

✅ Live karaoke: High-definition indoor live vocals, online concerts

✅ Post-production for films and TV: Narration, dialogue recording, indoor environment ambiance sampling

✅ Choir/ensemble: Multiple harmonies, small orchestral ensemble collective recording 

IV. Complete Standard Accessories 

1. U67 Electronic Tube Microphone Console × 1

2. Special Voltage Stabilization Power Supply Box × 1

3.  5-pin Shielded Cable × 1

4. Shock Absorbing Frame × 1

5. Multi-country Compatible Power Cord × 1

6. Hardened Aviation Storage Box (with Sponge Interior) × 1 

V. Product Core Parameters 

- Microphone type: Large diaphragm vacuum tube condenser microphone

- Diaphragm size: 34mm K67 double-gold-plated diaphragm

- Tube model: EF86 low-noise pentode

- Directional pattern: Heart-shaped, omnidirectional, 8-shaped switchable

- Frequency response range: 20Hz ~ 20kHz

- Maximum sound pressure level: 114dB (124dB with Pad enabled)

- Background noise: 17dB(A)

- Attenuation switch: -10dB Pad

- Low cut filter: 100Hz

- Power supply method: External 7-pin dedicated power supply (110-240V universal)

- Output interface: 3Pin gold-plated XLR balanced output 

VI. Summary of