Upgrade From SME IV to V - Worth It

I recently purchased the Analouge Productions UHQR The Doors LA Woman disc. I honestly don’t know how a 53 year old recording can sound this good on a 33 1/3 vinyl disc, simply mind blowing!

no, it's not amazing, it's analog and that means investing in the components that make up the turntable is very important.
Even on vinyl records from specialized audiophile houses dating back to the 70s, listening to them today you are surprised at how good they sound.
Vinyl has everything you need, the enthusiast just needs to be able to find the way to extract everything that is inside the grooves.
It's a shame that current commercial or audiophile vinyl pressings have reached unaffordable prices.

It is easy to keep the IV, I am keeping mine, at present there is no intention to reintroduce it, but that can always change in the future.

As the owned IV is a Donor Arm to be used, 'when it eventually happens', on a DD TT with a Plinth Design to have Three TA's mounted, ( 1 @ 9" - 1 @ 12" - 1 @ Variable P to S dimensions ). The idea that comes and goes, could be put in place  to show visitors to the Home System the differences between TA's on a TT that can mount Two TA's.

The present plan for the TA, is to watch how the value appreciates as a used sale item. If the IV or V model is entered into the used market today, and the sale is carefully undertaken. The two models are almost on par for being accessible to funds as a ATM.

There is still good experiences to be had, if the footwork is put in to get out and experience alternate devices being used to enable a Cart' to function. One of these experiences may prove to have a profound effect and make the idea of change to  become a unavoidable. A decision may be forced to be made, where one option chosen is seemingly going to be much more advantageous.

Making a decision about the IV, that's how it went for myself anyways.     

Exchanging the VandenHul phono cable for a Graham unit will be an improvement. The IC 70 and especially the IC-90 cables from Graham really add like to the SME tonearms.

Dear @mgattmch  This is what @bigkidz  posted before:

" IMO upgrade the phono stage you get much better results. "

Totally rigth, the phono in the C52 just can´'t do it in the rigth way so you needaway better external phono stage.

 About the IV vsV , no matter what the V is superior ( everything the same. ) If an audiophile prefers the IV over the V is only anecdotic and is what the ears of that audiophile and his preferences likes.

Again, you need a better phono stage. before you spend money in other tonearm or other cartridge.

Regards and Enjoy the MUSIC NOT DISTORTIONS,

R.