Parallel? How do you set the VTA?

Don't use the armwand, use the headshell to determine level. Level is just the starting point, adjust by ear.

Brf,

The headshell is parallel to the armwand on the Classic tonearm, which is not tapered. I found the headshell to be too small to accurately determine whether it's parallel to the record surface. Plus, it has two mounting screws sticking out, which makes it even more difficult to read its position. I guess a tiny level could be used, but I've never seen a level small enough available commercially that would fit on top of the headshell behind the screws.

Also, I realize ultimately the setting should be done by ear, but the Delos was designed to sound best with the tonearm parallel to the record surface as that's when the coils are apparently aligned optimally. So I would very much like to be able to tell objectively whether the wand is parallel, and take it from there.

Jperry,

How does the stack of cards method work? It's the first time I've heard of it. Thanks.

Use your computer word processor and print out a series of closely spaced lines (similar to an indexed card but more refined). Cut the paper to a manageable size and fold in the middle along one of the lines to create a 90 degree fold. Place the “L” shaped lined guide on the platter. Lower the tone arm onto the horizontal fold and align the head shell with the lines on the vertical plane. Since the cartridge is affixed to the head shell, you want to make sure the head shell is level. It does not matter if your arm tube is tapered or not. Once level, adjust by ear.

Happily my ear tells me when the setting is off, but as a base, how do you determine conclusively your tonearm is parallel?

Why should I want to? You said it yourself, this parameter is best adjusted by ear. Visual settings like "tonearm parallel" are mere approximations, someplace to begin the listening from.

With respect, a quest to "determine" the position of a mere approximation "conclusively" is nonsensical. I can level a cartridge or tonearm by eye in about 15 seconds. Then, whilst you're fussing with spirit levels, printed cards, magnifiers and other distractions, I'll have dialed in the optimal SRA by ear and be enjoying the music.

I set my arm initially with a bubble level on the headshell. If it sounds bloated, I raise the rear. If it sounds too shrill, I lower the rear. Level is usually pretty close to the final result though.
Also a good starting point for Azmith, although I use a Fozgometer for final adjustment, and then my ear.