Bock Audio 407
Cardioid Tube Condenser Microphone
The Bock Audio 4-ZERO-7 is Bock’s interpretation of the Neumann U47. It is a tube condenser microphone with a K47 capsule, built to capture the sound of the original U47.
The circuit is identical to that of the Bock 507, with a NOS EF814 glass pentode tube (wired as a triode) and a fully balanced, transformer-coupled output. According to the documentation, the use of a higher-value grid resistor allows the circuit’s low-frequency cutoff to drop from 40Hz to 10Hz.
The mic’s capsule is a single-backplate K47 type, manufactured exclusively for Bock Audio by MBHO.
The Bock Audio 407 is also known as: 4-ZERO-7.
The mic was released in 2014.
Specifications
| Pickup Patterns | Pads & Filters |
|---|---|
|
Cardioid
(26 mV/Pa; 20 - 20,000 Hz) |
|
| Capsule Dimensions | Impedance | SPL/Noise |
|---|---|---|
| Capsule diameter: 34mm Diaphragm gauge: 6 microns |
200 Ohms (Low) | Max SPL: 118 dB Self-noise: 18.0 dB(A) |
| Weight | Length | Max Diameter | Interface(s) |
|---|---|---|---|
| 716g (25.26oz) | 216mm (8.50'') | 52mm (2.05'') |
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| Power Specifications |
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