Ian, you may still need to adjust overhang for proper alignment if the cartridge mounting hole to stylus distance varies with your three cartridges. Arm height and VTF may also need to be adjusted, so it may not be a simple swapping of head shells. Then there is cartridge loading to consider too.
Do you think you may switch arms back and forth by simply swapping armboards?
I don't know if I will need to adjust overhang between the Atlas and Opus1 since they were exactly the same on my Black Beauty (which also is a fixed headshell - more or less).
I will absolutely have to change VTF!
If I switch arms, I will absolutely swap armboards. Would I do this as a way of changing cartridges? Not sure. I was originally thinking that I would use the 3012R for the Atlas (so I could have precise VTF) and the Opus1 on the Black Beauty (which it works very well with) but I will have to try my Opus1 on the 3012R and see how it sounds.
I'm still getting used to the 3012R's operational mechanics (the arm rest lock is a little strange and the arm feels so flimsy) as well as the sonics. I looked into my bag of tricks and found an SME phono cable (can't recall why I ever bought that but I did) and no longer have a cable issue per se. I feel like I'm hearing a little bit of a metallic signature that is probably the cable, but overall I'm digging the sound very much. I'm probably hearing my Atlas more accurately than with the Black Beauty (given the VTF issue I had) so some of what I'm noticing might be that. The sound is VERY clean and clear though; piccolos and other high frequency instruments are coming through nicely, bass is clean with good punch and transients are super. Piano is fantastic.
Best $2k I've ever spent me thinks.
I did buy a couple other phono cables to try (including the one rockitman recommended) and am looking forward to comparing. Also looking forward to trying the Opus1 and getting my dB Systems protractor to fine tune.
The one thing that you can't do easily at all with this arm is adjust arm height. That is a major PITA. You would hate this arm Peter since you couldn't adjust for LP thickness.
Otherwise the design is very interesting. It has a nice mechanism for adjusting course VTF, but by comparison the fine VTF is a bit frustrating - but overall WAY less frustrating than my Black Beauty and seems to sound as good. It might even be better but it's hard to know since prior to this past Monday I've only listened to the Etna (which I've now given back to the person who loaned it to me). While I did put my Atlas on the Black Beauty for a couple days before switching over to the SME, I did not have the VTF dialed in properly so in some ways I'm hearing two changes at once (Atlas + SME).