U 64

Primary use:

Polar patterns:

Common name: Neumann KM 64

Production Status: Discontinued / Vintage

KM is the acronym of “kleinmikrophon” meaning “little microphone”. The U 64 is a special version of the KM 64. It uses a removable Nuvistor instead of the standard soldered AC 701 K. It was designed for U.S. export and features an XLR connector instead of the standard small Touchel. It is not compatible with the standard KM series PSU and cables. The original KM family ( KM 53 – KM 54 – KM 56) was born in the 50’s as a result of the professional market request for high quality, but very small, microphones, ideal for TV productions. After ten years Georg Neumann GmbH launched a new KM tube series. The U 64 features the KK 64 capsule (also used in the KM 64 – KM 66 KM 84 and KM 86. This capsule uses MCF diaphragms and has a constant frequency response for off-axis sounds. The frequency response is virtually the same for sound sources within +- 135° (between 100 Hz  and 18 kHz). Sound sources located in a 135° circle around the microphone can be recorded with loudness variation but no changes in timbre. The U 64 was manufactured from 1964 to 1971.

Electrical Characteristics

Frequency Response
40Hz - 18 kHz
Output Sensitivity
0.9 mV/Pa
Max SPL
120
Max SPL, THD:
0.5
Self Noise (CCIR)
dB
Self Noise (DIN/IEC)
dB-A
Output Impedance
250Ω
Recommended Load
1kΩ
Powering
Proprietary unit
Supply Current
mA
Alternative Powering
Tube Model
7586 Nuvistor

Switchable Options

Pad
Filter/EQ

Physical Characteristics

Connector
XLR-5M
Connector notes
Available Colours
Matte satin chrome. Non-reflecting darl grey
Weight
100 g
Length
112 mm
Min diameter width
Max diameter
21 mm
Depth

Accessories

Included
Stand adapter
Optional
N6U single power supply. N62U dual power supply. N66U power supply for six microphones. N66K rackmount power supply.