Heiserman Audio H47tube

The Heiserman H47Tube is a meticulously engineered large-diaphragm valve microphone that delivers the authentic tone and performance of the iconic U47, combining vintage sonic character with premium modern components.

A Precise Tribute to the U47

The H47Tube stands as a tribute to one of the most revered microphones in recording history, the U47. Through rigorous side-by-side testing with a highly sought-after vintage U47, Heiserman fine-tuned every element of the H47Tube to achieve a near-identical tonal signature. The result is a microphone that reproduces the rich detail, harmonic depth, and perfectly balanced frequency response of the original, often indistinguishable in professional blind tests by award-winning engineers.

Accurate Design and Construction

Every aspect of the H47Tube follows the original U47 specification, from the integrated polar pattern switch to the precise geometry of the headbasket mesh. Heiserman has ensured that both the sonic and physical design of the microphone meet the expectations of professionals who demand authenticity in both sound and appearance. The H47Tube is handcrafted to meet the highest standards of durability and performance, offering premium aesthetics and reliable function for studio environments.

Two Capsule Options for Distinct Sonic Profiles

Heiserman offers the H47Tube with two capsule configurations that mirror the historical evolution of the U47. The HK47 capsule provides a balanced tone suitable for both vintage-inspired and contemporary productions, offering articulate mids, extended lows, and a clear yet controlled high-frequency response. Alternatively, the HM7 capsule replicates the classic M7 design for engineers seeking a warmer, more vintage character with a subtle roll-off in the upper frequencies, ideal for those preferring the traditional sound of early U47 models.

True-to-Original Circuit with Premium Components

The internal circuit of the H47Tube remains faithful to the classic U47 architecture, utilising 100 percent through-hole components for optimal reliability and tone preservation. The design features a custom-made BV08 transformer, renowned for its contribution to the signature low-end response and harmonic richness. A carefully selected NOS EF8XX series tube forms the core of the amplification stage, while premium NOS Mial polystyrene and Soviet paper-in-oil capacitors ensure tonal integrity and smooth transient response. High-specification Ohmite thick-film and KOA Speer resistors complete the signal path, guaranteeing precise performance and minimal component noise.

Robust and Practical Case Design

Unlike the fragile wooden cases often associated with vintage microphones, the H47Tube ships in a custom-moulded Pelican case engineered for superior protection. The interior features laser-cut, cross-linked polyethylene foam that is waterproof, shockproof, and precision-fitted to the microphone and accessories, ensuring long-term durability and transport safety in professional settings.