Lots of white noise and crackles, and intermittent problems.
I have had a serious issue for a long time with my AKG Solidtube microphone where I get tons of noise and crackles. It sounds like I'm standing out side and galeforce winds are blowing in my ear. This is definatelt a fault with and other equipment as I have used several other mics through the same channel, on the same desk and they have all been fine. I have even replaced the cable but the promlems still remain. Any ideas?
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Define what you call the transformer. The microphone has a power supply in a separate enclosure. Usually the output has 7 pins to connect to the cable to the mic. First you need to verify that the cable is good. With a multimeter, check continuity of each end of each pin. If one pin has no connection, the replace the cabble and your problem will go away. Try this first, then if needed we'll talk about the power supply.
It has dust or oxide inside. Go to Radio Shack and pick up a can of "Tuner Cleaner" or "Contact Cleaner". Using the tube that comes with the can, spray the switch liberally, trying to get some of the spray down inside the switch. While still dripping wet, work the switch back & forth several times. Let it dry out & use it.
If that's not enough... the mike will need to be opened up to gain better access inside the switch with your spray. No need to unsolder anything, you just need to get that spray inside the switch.
Don't use anything except "tuner cleaner" or "contact cleaner" for the purpose. Don't use WD40, don't use silicone spray, don't experiment. Let's get your mike working... and only tuner cleaner or contact cleaner is known to do that.
I would be inclined check your +48v phantom power supply to make sure the correct voltage is coming out and to check your cable. Failing that, if you have changed the tube once I'd be inclined to contact AKG Directly via email to find a service center or get furthur advice.
If the mic is a condensor you would need to have phantom power, or it will not work. Use a small mixer or externat power supply. We here at Pro Line Music Have small mixers that have phantom power. 215-736-8055
Had the same problem. Check the ground (earth) is attached properly to the mic. This will cause the signal to be interrupted and can also cause a phasing problem. A lot of techs don't check that when you send them for repair