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RE: "if you don't hear anything just return the cable."

Posted by unclestu on April 22, 2015 at 12:15:16:
I'm finding that power factor correction even though an audio system is on the small scale of things, makes a difference.
Even just using the .1 uF caps that are UL approved makes a difference. I initially though it merely shunting off noise, but I was informed by an EE that according to his measurements, it is affecting PF to a certain degree.
One of the things I have noticed is that running the snubbing circuits after the diodes, while making a sonic difference, ignores the spikes reflected back into the power transformer secondaries.
Since I use tubes, it is difficult to shunt the the B+ leads directly. Pondering the the reflection concept, I snubbed the other secondary outputs, namely the filaments (easy since they are low voltage). I was greatly rewarded by a much smoother and fuller sound. I was rather shocked at the amount of change and started to look at power transformers very differently.
Apparently the rectifier spikes go backward ( as was rather obvious) but can seriously contaminate the other secondaries. I have not really studied transformers, but it seems that such noise must be reflected and retained in at least the secondary windings.
We may be fighting more the effects rather than getting at the source of the issues in power transfer.
Of course YMMV and FWIW