Did I do a good thing or not?

@asa 

The silver Audioplan cable I use specifically for MM & MI cartridges never went into production - too expensive to produce.

@islandmandan 

I have a multitude of arms/cartridges & TT's.

Fyi when I had a hiatus from audio I ran a Shure V15vmr in a modified ET2 - superb results. Also like you I have a Dynavector 501 - the Shure V15vmr sounded very good in that arm as well. The V15 did not sound great with any of my other arms.

So from my point of view you have a great arm/cartridge match with the 501/V15 - I ran the Shure with the stabiliser brush removed.

@islandmandan 

That's great to hear. FYI the Dynavector Cartridges prevalent at the time of the 501/507 series launch were medium compliance.

You can get more performance  from your 501 by fine tuning the position of the rear counterweight.

If you take off the anti-skate, lift the cartridge ( or remove platter ) try blowing on the arm. When the rear counterweight is at its optimum you should be able to move the arm back and forth by gently blowing on its side. When you see this you start to understand the rationale behind the arms split inertia design. Effectively when properly set up the arm floats in the horizontal domain. 

@islandmandan 

@lewm 

For Dynvector arms use the markings for the counterweight as per the manual for initial placement then do the fine tuning of the counterweight from there - gently back and forth from there - you'll see when its right from my procedure above.