Got to thinking... how about 6 regular strings with 3 doubles on the high side.
 
Kind of like a 12 minus 3 set up.

I think it's too early to be thinking... 

mike_mccue
Got to thinking... how about 6 regular strings with 3 doubles on the high side.
 
Kind of like a 12 minus 3 set up.

BC Rich already thought of it - but you have to leave 1 string off.
 

Thanks drew,
 Mikey likey!

VOX made a 9 string guitar like you describe in the 60's. E,B,G were doubled and the wound D,A,E were single. Cool guitar if you can find one.

Thanks for that info John.
 
 

 
Noel Gallagher once gave me a 9 string guitar.
 
"What's that big knob at the front?" I enquired.
 
"Well mate" he replied, "That's our kid Liam, he's the singer" 

Taylor makes an 8 string baritone guitar with 2 added middle strings tuned up an octave. I played on them and they have a unique sound. B E A D G B
Since I haven't figured out how to play 6 strings and standard tuning I passed on it.

bayoubill
Taylor makes an 8 string baritone guitar with 2 added middle strings tuned up an octave. I played on them and they have a unique sound. B E A D G B
Since I haven't figured out how to play 6 strings and standard tuning I passed on it.

I prefer a six-string baritone (versus a 7 which is just a normal guitar with an added low B), so this sounds interesting to me.  I consider anything with octave strings to play about the same as it would without it (yes I know a 12-string can sound different depending on which direction you pick etc., but I'm talking about the overall width of all strings).
 
That BC Rich also looks very tasty!

mike_mccue
Got to thinking... how about 6 regular strings with 3 doubles on the high side.
 
Kind of like a 12 minus 3 set up.

I believe that this has already been done by John Mayall in the early 1960s.