Just curious if anyone knows..

They change their line up fairly frequently. Not different from some other manufacturers. It helps sales. Nothing wrong with what you already have.

Why did Audio Research do away with the SP-6b?

So they could sell the SP-6c,d,e ...  Had the 6c and wish I still had it. Have a Sp-9 MKii now, close but not quite the same.

JD

that's what manufacturers do. if you are happy with it then why worrying if its discontinued ? :)
it was pretty popular and you will still be able to sell it after sometime as some turntable tend to be more wanted after discontinued...

I have no problem with it...just seemed odd. I think Clearaudio has been making the same competing table forever now.