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Old 06-17-2016, 02:11 PM
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Electronic M Electronic M is offline
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Join Date: Jan 2011
Location: Pewaukee/Delafield Wi
Posts: 9,803
What I'd (and have done) is break out the lines from the computer audio input, and the tube device output, and check AC and DC volts between (all) out and (all) in lines with a DMM with both devices on and off.

An external isolation transformer and or an audio line isolation transformer should be enough to fix any AC leakage....Another option is to connect to a laptop running off batteries with the power adapter unplugged.
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Tom C.

What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4

Reading between the scan lines since the mid 2000's.
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