You have to do some search and then decide for the right mods. I mean real upgrades (bearing, electronics, plinth) and then look for a copper mat, a peripheral ring & stabiliser.
Are you shure that you can mount the SME 309 on this armboard?
You must first measure the pivot to spindle distance & then you have to find the corresponding effective length. Then you can search for arms with exactly this eff. length. Also, take care for the proper match between your current armboard & the potential arm base (of the new arm).
If you can avoid the fixed arm base and you can construct a new (outside the chassis) on a heavy surrounding plinth, then I think it is better to look for the SME 312S.
I'm warning you: The transference to a belt drive is a very traumatic experience that you are going to regret.
Leave the luxury marketing objects to some fashion victims & proceed carefully with what you have.
Trade your AT440 for the best AT you can afford and stay to MM, otherwise you must have very deep pockets for equal quality MC & a worthy phonostage (very few in the market).
Good luck
George
Are you shure that you can mount the SME 309 on this armboard?
You must first measure the pivot to spindle distance & then you have to find the corresponding effective length. Then you can search for arms with exactly this eff. length. Also, take care for the proper match between your current armboard & the potential arm base (of the new arm).
If you can avoid the fixed arm base and you can construct a new (outside the chassis) on a heavy surrounding plinth, then I think it is better to look for the SME 312S.
I'm warning you: The transference to a belt drive is a very traumatic experience that you are going to regret.
Leave the luxury marketing objects to some fashion victims & proceed carefully with what you have.
Trade your AT440 for the best AT you can afford and stay to MM, otherwise you must have very deep pockets for equal quality MC & a worthy phonostage (very few in the market).
Good luck
George