I have built a tube microphone, based of akg c60 schematic. But all this mic does is hums, i've worked on it forever and can't find the problem.
When i remove the grid to cathode bias resistor, 180M ohms, it starts producing sound, but still is quite bad sounding.
Anyone have ideas?
When i remove the grid to cathode bias resistor, 180M ohms, it starts producing sound, but still is quite bad sounding.
Anyone have ideas?
