I've had the BPT 3.5 for about 2 years now. Absolutely quite with no hum issues. I like the sound of this conditioner so much that I got an extension BPT power strip and hooked my 110 watt per channel tube amps into it as well (rather than into the PS Audio Ultimate Outlets).
To my ears, the BPT cleans up the sound and widens the soundstage. The treble in particular seems to benefit in extension.
Randy
To my ears, the BPT cleans up the sound and widens the soundstage. The treble in particular seems to benefit in extension.
Randy