The U 64 was a variant of the KM 64 small diaphragm microphone. Instead of the Telefunken AC 701, which was not as easily available in non-European countries, the U 64 used a tiny nuvistor tube.
Thank you for registering for the Neumann Newsletter. An email with the subject "Neumann Newsletter - Please confirm your registration" has been sent to the address you provided. Please click on the confirmation link in this email to complete your registration. Only then will you be sent newsletters from Neumann.Berlin.