Search Microphones

Share This Page

Related Microphones

Bock Audio 407

Pricing & Availability

  • MSRP: $7,175


407 Documentation

407 Awards

CardioidBock 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.


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'')
  • 3-pin XLR male (3)
Power Specifications
  • Includes tube power supply

Did we get anything wrong on this page? Please let us know!