When I connected the NT1-a to the audio interface today and turned on phantom power, it worked right away. I feel like the microphone is gradually working and sounding better since we started narrowing down the problem. For the past few days, when I'm not using the NT1-a, I've been storing it in a zip lock bag together with the silica pads. In addition, the environmental conditions have changed. It is no longer hot and humid and temperatures have dropped to between 8°C and 17.1°C (46,4°F and 62,6°F). Since the NT1-a seems to be very sensitive to humidity, this could also have a positive effect. All in all, I am very happy with this result and would like to thank you for your contributions and tips! I have learned a lot about dealing with used and non-functioning microphones and hope that this thread was also interesting for other mic builders. I like the fact that the NT1-a has very low self-noise and will experiment with it in the field. MANY THANKS!
