what impacts the sound quality more amp or pre-amp

as typical we i am always looking to improve the sound of my system with a budget in mind. That being said, I was told I would get more bang for the buck in investing on the pre-amp side of things and keeoing my existing amplifier. I have a SS system using B&K components and desire a more natural or as they say tubey sound with a larger soundstage. My budget is 500 - 800. My impression is I would do better by buying a Prima Luna 3 pre-amp versus purchasing a hybrid amp such as a MOSOCODE 300???

Dvdgreco,
As others have stated above, all components within a system matter, the weak link will drag the overall performance down every time. But to answer your specific question, in my experience I`ve had more profound change in the sound/character of my systems with power amplifiers more so than preamps without exception. The transition from solid state to push pull tube and then SET-DHT amps were major steps.

I think a high quality sounding preamp can carry a mediocre amp and visa versa. But without question you will want to eventually upgrade any other inferior component(s) to get the desired sound you are ultimately seeking. I would tackle the preamp first since its job is the toughest and it is one of the hardest components for a manufacturer to get right. To find one that sounds decent within a certain budget can be difficult but not impossible.

A few years ago I owned some B&K components & liked them but found out that some of their models stand out more so than others in terms of sound quality. That would include some of their older gear.

Everyone is correct and its obvious they have all had vast experience in this hobby. If I were you I would upgrade my preamp first, you might look at some used CJ like PV10 in particular.

You get a real bang for your buck and you get very tubey sound but totally grain free and non-fatiguing. Just an option.

Dvdgreco, if your looking for advise on the best bang for your buck system improvement, why not post your system? Be careful of advise touting personal technology preferences without considering your personal budget and system.