Question about Crown CTS600 2-Channel Amplifier

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Input 60Hz hum

Crown CTs 600.
The amp works...that is sound comes out, albeit with 60Hz hum.

Hum only occurs when the minus & the ground input pins are connected together, which is neccessary when using an "unbalanced" input.

If a source is connected "balanced", the hum is barely noticeable, but still present. (The balance circuitry is doing its job...as well as it can)

With nothing connected to the inputs, shorting the minus and ground pins causes very loud 60Hz hum.

If nothing is connected to the inputs, there is no hum.

If I had a schematic and or the service manual I think I could find the problem. Without it, it's nearly impossible, due to the board being SMT.
Any help would be greatly appreciated.
Thanks,
Chuck

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I had the same problem once and in my case i had accidentally used ground wire for signal. pls check ur connections again. one check u can do is set the high pass filter to 70Hz and see if that cuts out the low hum.

Posted on May 02, 2010

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