power outlet

If your preamp has power outlet connections installed into the back of the preamp would it be better to plug other audio equipment from the power outlet in the wall or would it be problematic to plug them into the outlets in the preamp?
I've owned several preamps that had AC outlets on the back. I never used them.

I was told a long time ago that they can cause extraneous noise when used.
Personally, I would avoid using outlets on the back of other components. That said, there's no risk involved if you wanted to try it and see if you can hear a difference.
Are pre-amps still made with outlets on their back panels? Audio Research, Quicksilver, etc. stopped doing it years ago. Having more A/C that close to noise-sensitive high-gain pre-amp circuits is something to avoid.
Have not ever used them as well for fear of noise feedback.Was just wondering other members experience.Thanks.
Vintage NAD 3020 does,thus the question.
The power outlets are not for convenience, per se. When the practice of including power outlet connections on the back of components was more common, the connections came in two ways ... switched and non switched.

The switched connection would cut the power/ allow you to shut-off the component plugged into that connection when you shut off the main component. The non-switched connection always stayed on and was designed primarily for a turntable, which you would want to keep running until the turntable finished playing. This assumed an automatic/ semi automatic turntable.

The thinking back then was different to today's practices ... shut off your components rather than keep them on ... automatic turntables rather than manual turntables ... two prong plugs rather than 3 prong plugs.

Can you hear a difference ... I suppose ... but who knows and why worry about it? It is like the folks who swear they can hear differences with different fuses. After 58 years with the same ears and 50 years of owning stereo equipment and 50 years of headphone use and 40 years of airplane travel, I am surprised I can hear, as well as I do.

Wanted to see if I could have the power cables in one specific area opposed to being spread out as much.Just wasn't sure if it would affect the sound in a bad way or put unwanted stress on the amp in question?Thought I would ask first from members who would know.
That said, there's no risk involved if you wanted to try it and see if you can hear a difference.
True for source components, but absolutely do not plug in an amplifier or anything with an amplifier (powered sub) to those outlets. That will definitely be a major risk.
John421, there is nothing to recommend a line stage with outlets on the back, apart from convenience or a quick way to disconnect everything in an electrical storm. I have everything plugged into an ac conditioner and can quickly unplug everything by pulling the pc to it.

I must say, however, that I have not seen such a line stage in perhaps twenty years.
With vintage equipment, use it in the way it was designed and you should be fine. When the NAD 3020 was introduced, it was turntables and tape decks, possibly a lava lamp. John - what are you planning to plug into the back of the amplifier?
If anything just my turntable or cd player.Have four different cords running to one area and was thinking to plug the NAD and HAFLER 220 into the wall outlet and cd player and TT to the NAD.Have a 6ft Pangea c7 power cord running from the Magnavox cd player so maybe thinking just the TT.
With the TT or cd player you should be just fine. They are not big power draws.
If you look closely at the verbiage surrounding the outlets there should be a rating for maximum power draw, usually in watts. Sum up the wattage requirements of the devices you wish to connect to make sure they do not exceed the preamp's output rating.

In your case, a TT and CD player generally draw very little power so you should be good to go. But check the ratings nonetheless...

A few years ago I was hired to provide a sound system for a summer series of outdoor weekly jazz shows on a little temporary stage…had to run a long SINGLE AC cable from an outlet across a lawn to power EVERYTHING. Mixer, main speakers, and a couple of monitors (2 stereo PA amps)…usually a bass amp showed up (or ran direct with a direct box and mic), miked the drums (kick mic and a good omni condenser overhead was enough), and the bands usually had a digital keyboard of some sort (with an amp I miked, or a direct box), and I miked everything else like horns, singers, percussion, etc. Somehow it all worked perfectly and sounded great. Go figure.