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RE: Dynaco 400 left channel crackles when furnace cycles

161.44.67.201

Posted by JonM on January 13, 2011 at 09:24:54

In Reply to: Dynaco 400 left channel crackles when furnace cycles posted by ttone007@gmail.com on December 28, 2010 at 09:44:28:

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...

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Kimber Kable

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