32.5/72 BOARDS

I HAVE BOTH A 32.5 AND A72 PRE AMP AND HAVE HEARD THAT PERFOMANCE CAN BE IMPROVED /CHANGED BY REMOVING UNUSED BOARDS ie PHONO AND TAPE BOARDS.MY PROBLEM IS IDENTIFYING WHAT EACH SET DOES.I DO KNOW WHICH ARE THE PHONO,THE REST ARE
(72) 324/7
328/1 VARIABLE
729/1
321/5
325/7 X 1
HAS ANYONE HAD EXPERIENCE OF TAKING THE BOARDS OUT, GOOD OR BAD.

I DO PREFER THE SOUND OF MY32.5 OVERALL ALTHOUGH THE 72 MIDRANGE IMO IS MORE OPEN.
I USE THE TUNER INPUT ON THE 32.5 TO ALLOW THE USE OF SNAIC BUT CANNOT SEEM TO USE DIRECT BOARDS THAT THE 72 CD INPUT HAS.CAN SOMEONE HELP ME .

DAVID.