Heiserman H251 Large Diaphragm Tube Condenser Microphone - Timeless Audio Precision
Experience the pinnacle of audio recording with the Heiserman H251, a meticulously handcrafted recreation of the iconic AKG C12. This large diaphragm tube condenser microphone blends vintage authenticity with modern engineering, featuring a 6072 TAD Highgrade tube, a Generation-4 HK12 brass and acrylic chambered capsule, and switchable Omni, Cardioid, and Figure-8 polar patterns. Designed for audio professionals seeking unparalleled clarity and fidelity, the H251 delivers exceptional sound capture for studios and on-the-go sessions alike.
A Faithful Recreation of a Legend
The Heiserman H251 is more than a microphone—it’s a historically accurate tribute to the AKG C12, crafted with extraordinary attention to detail. At its core lies the Generation-4 HK12 capsule, constructed with brass and acrylic chambered backplates and 6µm gold-sputtered DuPont Mylar for rich, detailed sound. Paired with a 6072 vacuum tube and a T14/1 transformer—modeled after a pristine 1961 vintage unit—this mic brings the warmth and character of a classic era into your recordings.
Premium Components for Superior Sound
Every element of the H251 is engineered for excellence. Featuring Vishay and Takman Rex resistors, NOS polystyrene and PIO capacitors, and a true-to-original wet Tantalum output capacitor, this microphone ensures precise audio reproduction. The acrylic circuit board, full acrylic head assembly, and original rotational pattern switch with CK12 saddle, felts, and foam cushioning maintain its vintage integrity while delivering modern reliability.
Versatility and Durability for Any Session
With a frequency range of 20 Hz - 20 kHz and a max SPL of 130 dB, the H251 excels in capturing everything from delicate vocals to powerful instruments. Its switchable polar patterns—Cardioid, Omni, and Figure-8—offer flexibility for diverse recording needs. Complete with a custom bulletproof power supply with world-switching capability, a 7.5-meter Sommer tube mic cable with a bespoke 251-style connector, and a rugged flight case, the H251 is built for professionals on the move.
Key Features of the Heiserman H251
- Highly detailed recreation of the 251 large diaphragm tube condenser microphone
- Generation-4 HK12 capsule with brass and acrylic chambered backplates and 6µm gold-sputtered DuPont Mylar
- T14/1 transformer, engineered from a pristine 1961 vintage unit
- Premium components: Vishay and Takman Rex resistors, NOS polystyrene and PIO capacitors
- Includes custom bulletproof power supply with world switching, 7.5-meter Sommer tube mic cable with 251-style connector mount, and rugged flight case
Technical Specifications
- Length: 216 mm
- Diameter: 50 mm
- Polar Patterns: Cardioid, Omni, Figure-8
- Capsule: Generation-4 HK12 Brass and Acrylic Chambered
- Tube: 6072 TAD Highgrade
- Transformer: T14/1
- Sensitivity: 17 mV/Pa ± 1 dB
- THD @ 1kHz @ 1Pa: <0.3%
- Impedance: 200 ohms / 50 ohms (switchable via jumper links)
- Frequency Range: 20 Hz - 20 kHz
- Max SPL: 130 dB
- Self Noise: 10 dBA
