Lightning quick DYNAMIC amp in the under $1000 range

It's still in my cart on Amazon. Haven't pushed the button yet.

Question: would the power cord still make a difference even when all my gear is plugged into a line conditioner? Would the line conditioner need a power cord upgrade, too? What about my preamp? Is the amp the best place to put it if just buying one?

I would start with the one, for your Behringer, and let your ears tell you. Nothing more. The new pc will be obvious, but it will require a bit of " break in ". How much, depends. Let the amp play music with the new cord for a week, and you will be there ( a tuner or streamer, even at low volume ). I did not ask this, do you leave your amp on 24/ 7. You should, if you listen every day. It is not a class A amp, so you will not be spending so much on electricity. Just get the one pc for now. Enjoy ! MrD.

I do listen everyday, but I always turn it off after the listening session. Would you do this just to break in the cable or do you always leave everything on all the time? Seems like it would drastically decrease the life of your equipment no?

Tube equipment, and hot running Class A amplification, I would ( have ) turned off. All other ss gear, I leave on, which sounds better, and I believe, lessens wear and tear on a product. But, both of these points to leave gear on 24/7, is always debatable. My ears tell me the first, and I have never had a solid state product fail on me. Well, I did have an older PS audio power amp, a 200 C, smoke a little upon turn on, but other than that, never. YMMV

RE Lightening quick
can't be done. electricity moves much slower than lightening.

RE PC & PLC
the supply cable to the PLC adds its influence to everything downstream of it. naturally then this single PC can be quite influential and one can deal with it either right off or later on with this knowledge in mind.

RE power on 24/7
its all about heat. well, almost.

with consumables like tubes, especially NOS tubes, judicious use is pretty much preordained. shut it/them down when not in use, unless you are sitting on a goodly supply of vintage tubes.

... or you don't mind re-tubing more frequently.

if you can control the temps where the gear resides and maintain it pretty chilly, I'd say leave whatever on all the time.

if the gear is pure Class A it has to be running a signal which will lower the temp and or increase the efficiency of the amp. even if the volume is very low.

heat, especially excessive heat kills electronics more than repeated powering up and down.

in the Navy shipwide public address system was all tube based of course there were other sensitive electronics which when energized were kept on for months at a time without failures due to heat because the ambient temp in that space was maintained quite low..

certainly it was quite cool in that space! ambient temps were usually in the low to mid 60s.

lessen the ambient temp, keep the gear cooler and you will extend the life of your electronics.