Newbie needs advice

I have a Quad 34 pre-amp, Quad 306 power amp, Cerwin Vega VS-10 speakers and a pair of Vestax PDX 200 turntables. I also use a Vestax PMC-06 mixer which also works as a pre amp for the turntables. The mixer also has bass, treble and loudness controls. I also have the Mardaunt Short Alumini 9 is the subwoofer.

As you can see I have a DJ set up along side the vintage amps. My question is, how does the Quad sound quality compare with more up to date amps out today. I know everyone says if it sounds good to you then be happy, but I just like to know someones opinion with more experience. Is it worth me upgrading the Quads or would i get better sound quality with another amp.

I hope i'm not making an ass of myself asking these question.

Look forward to your replies

Ace