The following text is from the March, 1966 Neumann specifications sheets. The U 67 Condenser micro­phone is a newly developed multi-purpose studio micro­phone. It has an attractive shape and possesses first-class transmission properties and a number of new advantages. The U 67 Condenser Micro­phone can be used in a multi­tude of cases in recording, broadcasting, and sound reproduction. From a dimension point of view, it lies between the group of miniature micro­phones and that of the older standard type of con­denser micro­phones. By relinquishing the absolute miniature type of construction, it is possible to use reliable standard components as well as an approved easily replaceable micro­phone amplifier tube with plug socket, a type which can be obtained all over the world.By means of three switches, arranged at the base of the head assembly, the three directional characteristics, frequency response, and transmission ratio can be adapted to requirements. The frequency response of the micro­phone, also in the upper audio range, is practically linear for frontal sound pickup and does not show the commonly found rise. This enables the micro­phone to be used especially at a short distance away from the sound source without getting an unnaturally sharp sound impression. A new type of circuit considerably attenuates frequencies below 30 c/s already before the control grid of the micro­phone tube, whilst frequencies above 40 c/s are transmitted unaffected. The often feared overloading of the micro­phone tube caused by excessive movements of the membrane due to wind, floor vibrations etc. has thus been prevented. This was not possible with the commonly used rumble filters at the output. If the bass attenuation exceptionally is not desired, frequency response of the micro­phone amplifier can be linearized by disconnecting a small wire bridge in the micro­phone. The limit frequency of this bass attenuation can be shifted to 100 c/s by means of a switch located on the micro­phone (favorable e.g. for recording of speech or in television studios).Specifications Frequency range: 40 to 16,000 c/sDirectional characteristics: Omni-directional, Cardioid, Figure 8Sensitivity: Omni-directional: 1.1 mV/µb
Sensitivity: Cardioid: 2.0 mV/µb
Sensitivity: Figure 8: 1.4 mV/µbTotal harmonic distortion: 0.5% up to 116 dB SPLThis auction includes the Pelican Heavy Duty Hard Case
. Sold as is, where is and can be re-checked if needed in Belgium.
Contact me for any question I’m selling this set because of stopping my professional activities and will retire far from Europe.
I still have rare and much sought-after devices for sale. Watch my eBay a little later for complete list of machines.   Thierry Allard +32 473 85 89 27