It happens with great effort to buy a neumann U87 p48 of the year 83. This worked great for 2 years that I have in my possession, but today he stayed silent. Over was recording the head of a battery. I thought it was problem was with the cable or phantom power, so switch to another channel with another cable and nothing happened. After several attempts to connect it again and it worked perfect. Only this time it lasted about 6 hours and remained silent again. I've tested on several channels at different pre, with different cables etc and does not have have fallen silent. The microphone estubo always out of smoke and humidity, never a blow tube and was always switched on and off without taking on the phantom power.
The capsule will be dead? be any component problem? or was required to many decibels?

I hope you help me to guide me which is the fault. Can you send me the diagram of p48 U87 to see if I could repair them.


Gracias
Carlos Alfaro

gatoalfaro@gmail.com
contacto@septimacuerda.cl