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Author Topic: Need advice about noise on Aerco preamp  (Read 425 times)

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Offline jwo

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Need advice about noise on Aerco preamp
« on: February 02, 2017, 10:50:36 AM »
I picked up an Aerco pre here in the Yard Sale section. It worked well for a while, now I am getting some noise from it and would very much appreciate some advice.

I'm powering the Aerco off a Tekkeon external lithium battery, and I noticed a "whine" in the signal. I'd been running the Tekkeon at 9v, so I raised the battery voltage to the next few steps up in voltage. When i raise the voltage, the "whine" turns into "chirping".

I tried a second charged battery and got the same results. I moved the mics to my other Aerco which runs off 9 volts, it not only had no whine in the signal but a much hotter signal overall. I know there are a few different gain ranges for the Aerco, so that might account for the gain difference. Are there internal gain settings I can change myself or does this require a trip back to Jerry?

I'm certain that I've isolated the noise to the Aerco pre. What troubleshooting steps might I take before shipping it off for repair?

Thanks in advance,

Jason

 

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