Would it make sense and be safe to put power conditioner in front of PS Audio regenerator?

I wouldn’t. It could restrict the power to the input of the Power Plant Premier. If anything just use a good 5ft or 6ft audiophile grade power cord. Minimum 12awg conductors. (Borrow for a listen before you buy, if possible)

How tight are the wall receptacle outlet electrical contacts. Does the plug fit snug or loosely in the outlet? If the receptacle contacts have lost their contact memory retention to male plug blade contact pressure you might want to hire an electrician to install a new outlet. (Poor contact pressure can cause series micro arcing when a load is connected. Series micro arcing causes AC Line harmonic distortion.

I doubt the Landlord/Building Manager would have a problem with that. You could always give him/her a call for permission. He/her may say yes, but you will have to hire the electrical contractor/electrician he/she uses.

All you need is a good heavy duty spec grade duplex receptacle outlet. The electrical contractor/electrician, if the electrician knows the electrical safety code(s), by Code he/she can only install a UL Listed duplex receptacle. If the circuit that feeds the outlet is 15 amp then he/she per Code must install a 15 amp duplex receptacle.

No. the PP rectifies the input AC and starts all over inverting it. anything you do upstream can only hurt. traditional power conditioners have a nasty habit of limiting current.

a dedicated line does almost nothing to improve the quality of the power--it ensures that you have adequate current. It also ensures you don’t have something else plugged into the circuit that causes noise. you can manage this yourself by figuring out what other outlets are on the same circuit and either moving things to other circuits or making sure noisey appliances are off or unplugged while you are listening.

Jerry

a dedicated line does almost nothing to improve the quality of the power--it ensures that you have adequate current.

Strongly disagree... Depending on the wiring method(s) used for the in and out branch circuit wiring connections at every wall outlet box plus ceiling lighting outlet boxes of a convenience outlet branch circuit a dedicated branch circuit can make a big difference.

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@jea48 and @carlsbad2   -  I agree.  Straight from the wall to the PP.  12 awg or heavier power cord with solid plugs on both end from the wall.  It doesn't need to be a very expensive one because the key thing is to get the needed current to the PP.  And as @jea48 mentions, a worn out, light weight, loose receptacle should be replaced.

Not in front of–but you could try beside. Use one for the source, the other for the amps. Use same twin outlet. Also try direct to the receptacle with no conditioners. 

I see. I won’t do it. I use Purist Audio power cord from the wall to the PS Audio Premier and the connection is tight.

Without the regenerator it is incomparably worse, everything should be plugged in it.

Not in front of–but you could try beside. Use one for the source, the other for the amps. Use same twin outlet. Also try direct to the receptacle with no conditioners. 

This brings up a thought after reading the post.

I assume the output of the PS Audio regenerator is wired as a grounded AC power system. Therein NOT left floating. Floating...Therein two Hot ungrounded conductors with no reference to ground.

If the AC output is a grounded AC power system (which I hope it is) and not all audio equipment that, is connected together by wire interconnects, is fed from the regenerator, like say a power amp that is plugged directly into the wall out, are the two 120V power sources in phase with one another? 

Simple test. Use a multimeter, (set meter on AC volts auto scale, or above 250Vac scale). Measure from a receptacle HOT contact (small slot) on the regenerator, to the HOT contact of the other receptacle of the wall duplex receptacle the regenerator is plugged into.   

If the two 120Vac sources are in phase with one another you will measure zero Vac nominal. If the two 120Vac sources are out of phase with one another you will measure 240Vac nominal. 

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Just checked the Premier. The input voltage it shows is 119 and the output voltage is 121. Why does it increase the voltage when 119 volts is perfectly fine ? You can't adjust the output voltage, or frequency.

Do you think that newer PS Audio P5 would be significantly better ? I could also experiment more with power cords from the wall but this Purist works well, I did compare it to a few others.

"I could also experiment more with power cords from the wall but this Purist works well,"

Unnecessary audionervosa.

I use a PPP. It's 18 years old. PS Audio refreshed it in 2020, and good for another  10 years. They no longer support it.

The output display ISN'T 100% accurate depending on the calibration of the output/ display. There's  an adjustment pot underneath  the unit to fine tune it, which is done at the factory to display 120V.

With a Google  search and  a MM it can be done, if you're  a tinkerer. If you don't have experience with live circuit boards, best to just leave it be.

"Do you think that newer PS Audio P5 would be significantly better ?"

P5 is 2 generations old. Long discontinued. A newer PP isn't  going to magically transform  your system. If anything the psychological  "new box" will be in play for a hot minute. Naturally, just my take on using a PP.

I am not going to replace the Premier for as long as it works properly. Yes, I heard it is no longer serviced by PS Audio.

I wouldn't exactly expect dramatic improvement from the newer regenerators, significant improvents perhaps.

But the wall current is not going to improve, I guess, anyway.

@jea48 Not saying I don't recommend a dedicated line if you can.  I have one, 10 awg.  

But the dirty power happens outside the home and you can't do anything about it with a dedicated line.   Not most of the dirty power, but 100% of it so long as you have nothing else on the circuit.

I discussed getting other loads off your audio power circuit.  

Jerry

But the dirty power happens outside the home

Actually not. The majority of it happens within the home.

and you can’t do anything about it with a dedicated line. Not most of the dirty power, but 100% of it so long as you have nothing else on the circuit.

If you mean a convenience outlet branch circuit. Unplugging everything from the wall outlets except the audio system does nothing if the in and out wiring connections are not solidly connected connections. It’s possible there might be 8, 10, 12, or more wall duplex receptacles on the branch circuit wiring. The OP’s audio system might be on the closest outlet to the electrical panel or the farthest one.

Like I said in an earlier post a poor wiring connection can/will add noise, harmonics, into the circuit wiring that will transfer to the audio equipment.

Three things needed for a good electrical connection.

Clean connection.

Surface area.

Contact pressure.

I have no idea what wiring method was used to makeup the connections. The worst, imo, would be cheapo residential grade stab in the back duplex outlets. Junk! (Not to be confused with a duplex receptacle that uses a terminal plate that is tightened down on the wire by the 10/32 side terminal screw. The stab in the back duplex outlets are notorious for making poor, bad, in and out connections. Every one of them adds noise. Don’t forget there is a hot and neutral conductor. Four connections per outlet.

Then, it’s not unusual to have ceiling lights on the same convenience outlet branch circuit. Maybe they are can lights. Lamps are screw in LED. Add all them noisy drivers to the branch circuit.

Example: Stab in the back wire connection.

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I wonder if audiophile grade outlet would help. No idea about wiring quality.

"I wonder if audiophile grade outlet would help."

Listening to your setup from 11:00PM to 4:00 AM while the grid is less strained will probably yield better results than buying more audiophool accessories.

Yeah, after midnight it is almost always better. Problem is that you have to keep the volume down, though I can listen at moderate level at any time of the day, the building is built quite well.