Amplifier is now off the Power Conditioner

We need to distinguish between conditioners and regenerators here. The first simply filters the AC. The second regenerates it in a cleaner state and provides a store of energy for quick bursts of power so it shouldn't strangle the sound.

My amps have huge power supplies (I know, I built them). The output stage of each mono has >340 joules of energy storage! In a Class A amp! I find the sound to be cleaner and more consistent with the regenerators in place.

After increasing my utilities supply amperage and having a contractor install a sub panel with uninterrupted dedicated circuits the improvement was substantial. All for less than $1k.

Lowest impedance path all the way back to the mains generating source is the best thing for unregulated poweramps power supplies.

If you have the knowledge or experience you can do this yourself, if not please get an electrician to do it.
The best way to power amplifiers, is to have a dedicated mains circuit for your amps, and a good heavy duty contact mains fuse for it, I prefer the old fashion ceramic push in with fuse wire instead of circuit breakers as they have very beefy brass contact wipers, where circut breaker do not, as they have a switch wiper inside them, as well as the weaker push in contacts.
And get your electrician to tighten all contacts (active neutral & earth) while he's at it before and after the meter box.

I even got the electricity suppliers to come out to clean and tighten the barge board contact to the house and where it connects the the mains line as well, as these get green and compressed and get loose with age. and should be cleaned and re-tightened as well.
The difference was quite stunning, especially in the bass.

No mains conditioner/regenerator can make up for these high resistance problems above.

Cheers George

Would like to know what brand of power conditioner the original poster was using. I use a Tice Power Block/Titan combo on my Modified Adcom and I like the results.
Cheers

My 38-watt tube integrated definitely has livelier dynamics when not plugged into my PS Audio Power Plant Premier. I've got a dedicated line for the PPP, and another for the amp. Your mileage may vary.