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Original Message
RE: Dynaco 400 left channel crackles when furnace cycles
Posted by JonM on January 13, 2011 at 09:24:54:
I'd suspect a power supply issue somewhere, letting through a transient in the AC when the furnace cycles. Since the 400 uses a common power supply for both channels, and given the noise happens with both amps, I doubt it's your amps. I'm wondering if it's something upstream causing it.
- Do you have a preamp or source that 1) is feeding both 400's, and 2) has separate power supplies for left and right channels?
- Is the noise affected by the 400's volume controls?
- Does it happen if you have nothing connected to the amps (other than your speakers)?
A little experimentation and simple deduction should help isolate the cause...