#2
it's very possible, but you'll need a really thin A-string. something along the lines with 0,08 or even 0,07
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#3
that was acualy the original idea for the seven string. uli roth and steve vai and even george lynch all tried it and all found that the high a was prone to breaking verry often to the strings thinness.
#5
them strings will not work, i have tried it with 9s and the only way it works is if you detune for that set up.

you will need eather a 6 or 7
#6
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A
D
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E
A


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Marshall Harrison has a Conklin custom that's 3/4 size and tuned that way but on a standard 7 it's not really practical; Steve Vai tried it for a while back during the Passion and Warfare days but decided all the string breaks weren't worth the hassle.

Edit: De-tuning and then adding the high string would work a lot better, I know the guys in Mithras tune that way; they used to play 6s tuned to A# but then got 7s and just added an extra high string rather than the low string that most other people would use. I'm not saying you should go that low but tuning down to at least D standard would be a good idea.
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#7
aye.. your A string would be so thing and under so much tension.. it seems unlikely to be of any practical use.

^^ the guy above me, his idea would probably be feasible.

detuning to maybe D or C# and then adding the high string would likely work.
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#8
Adding a high A is now possible with 0.006 strings

you can get them here

http://www.octave4plus.com


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#9
Maybe you could get away with it if you used a .08 for the high E? I dunno.
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#10
Further to my earlier post, the Marshall Harrison Conklin in action:

http://uk.youtube.com/watch?v=B7Au7HrjV6Q
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#11
What about a pretty short-scale guitar? Like just 22 inches?

Other than that, I'm with the guys saying downtune a little. I currently have a .9 (I think) tuned to the G just below the A you're going for on my guitar. Been there about 6 weeks and it's fine.
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#12
With a short-scale or fan-fretted design, yes, it's very possible. Other than the aforementioned short scale guitar Conklin made Marshall Harrison, they've also made a few fan-fretted 7s and 8s with high-A strings. They're not the only guys that have done it either.
It wouldn't really be practical on a standard-scale guitar though.