Telefunken Elektroakustik R-F-T AK47 Mk II
Multi-Pattern Tube Condenser Microphone
The R-F-T AK-47 Mk II is a revised version of Telefunken Elektroakustik’s AK47, a multipattern tube condenser.
The original AK47 was designed by AMI, and used AMI’s proprietary “BV47” transformer coupled with a Telefunken EF732 tube and a Chinese K67-style capsule. Both the original and the Mk II are 9-pattern microphones built into an AKG C12-style body.
Telefunken Elektroakustik’s licensing agreement with AMI lapsed in 2009. The company revised the microphone by sourcing a new transformer modeled after the U47’s BV8. According to Telefunken, the transformer is manufactured in California.
Like the original AK47, the Mk II uses a NOS Telefunken EF-732 tube.
The Mk II capsule is described as model TK47, which appears to be a K67-style condenser capsule: dual backplate, dual diaphragm, center-terminated.
The circuit was redesigned to best utilize the new transformer:
Through continued research, the AK-47 MkII’s new amplifier better employs the extended low frequency capabilities of the original 1950’s transformer design. Additional modifications have introduced premium quality components into the circuit layout in order to take full advantage of the extended frequency response capabilities.
Careful attention has been paid to current management utilizing wide, direct traces and large ground planes within the amplifier in order to increase low frequency articulation, and lower the noise floor of the tube amplifier for better overall detail.
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The mic was released in 2010.
|Pickup Patterns||Pads & Filters|
(14 mV/Pa; 20 - 20,000 Hz)
Cardioid (14 mV/Pa; 20 - 20,000 Hz)
Bidirectional (14 mV/Pa; 20 - 20,000 Hz)
| Diaphragm diameter: 25mm
Capsule diameter: 32mm
Diaphragm gauge: 6 microns
|200 Ohms (Low)||Max SPL: 132 dB
Self-noise: 16.0 dB(A)
|765g (26.98oz)||241mm (9.49'')||45mm (1.77'')||
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