RIP Moderator-Mitel, Panasonic
Joined: Dec 2005
Posts: 7,056 |
Matt, if you are using a non-601 intercom, You may be just plain overloading the 601's power supply. That will cause hum and consider it a warning from the 601 power supply! John C. (Not Garand)
When I was young, I was Liberal. As I aged and wised up, I became Conservative. Now that I'm old, I have settled on Curmudgeon.
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