agree with larryi. What measurements did you take. Did you watch the line voltage at the output of your conditioning mess long term. Something’s wrong.
Example: this is unlikely the real issue, just an example of how things can go wrong. Three power conditioners are used in series to clean, clean more, adn clean even more. Now i agree there is no such thing as "too pure" power, but what you may get is either:
1. a voltage drop on each that either takes some piece of your system out of voltage regulation. Bad things happen then.
2. You keep increasing series (output) impedance and dont deliver the current necessary on demand. A streamer doesn't need much, but a power amp may. And when it draws heavily (back to #1 - voltage drops, goes out of regulation).
3. If no regulator, maybe the bias falls out of class-A, since many bias circuits are voltage dividers and you get a % of the input voltage. yea, its a bit more complicated, but the effect still exists.
or of course, just broken.