B&K preamp question


I would like to hear from those that may have experiences with the b&k PT 3 and PT 5 tuner preamps.  I know the PT 5 has balanced inputs which i do not care about but it also sold for $250 to $300 more then the PT 3  when new yet they appear to be the same thing except for the balanced inputs. Is there a sonic difference between these two? Are the insides different parts wise?  Thanks
geph0007

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Am I any better off with a NAD C160/ 162 or mid 90s Yamaha CX2?  I swear I should just stick with integrateds.