Well I suspected that too, but changing the cartridge only is what fixes them.

The origional mics are varied in age, some as much as 12-15 years. The mics I have that are still new in the box, we bought about 2-3 years ago. Just wish I could find new cartdriges as good & sensitive as the ones those new mics have in them. Motorola's replacements today are not as sensitive.

Have problem with HMN1022B Maratrac mics loosing sensitivity over time. Have confirmed the electret cartridge is the culpret. I have new mics that have great gain & have confirmed that stealing the cartridge from one of these new ones & putting it in the old mic fixes the problem. The replacement ...

Hello,
We have our own comm. dept. & maintain our own fleet. Have a couple 48Mhz 100w (we have AK & BK versions) Maratracs with seemingly inoperative logic boards. Symptoms are--pwr. supply voltages are present & ok, unresponsive when turned on (clamshell heads), no beeps, control head lights come ...