carbon microphone replacement

[dsk]

No, but in that moment the dial goes to rest position the transmitter use some time to increase the current from 0 and that is enough to make trouble for e.g. the old PAP2 ATA from Linksys.  Putting in a carbon transmitter and everything works, but of course with the typical carbon transmitter sound.  A 330 ohms resistor across the transmitter reduce the transmitters output in the system, but it helps. Maybe a zener diode may solve it? I just do not have the right one here, it should be rated something like 4 volts.
dsk

[countryman]

Ah, now I can see what the problem is.
Some of the German transmitter capsules have a 5.1 Volt zener diode built in. I found one in a brown AKG DKO48 at least.