I've been using 47 Labs OTA (26 gauge solid CU) since 2001 with 300B and 2A3 DH/SET amps.
I started out with Reynaud Twins MkII speakers and then switched to vintage wide band single driver speakers in 2002 (Stepehens Trusonic 80FR, Elac S517 plus a few Coral's over time).
I recently tried Neotech 22 gauge solid CU (see link) which I like very much, plus it's less expensive and more readily available that the 47 Labs OTA.
I use bare wire ends (no connectors) which sounds better to me.
There is a review (6 Moons) of the OTA in which it is compared to the A23, but unfortunately is is by a reviewer that I don't have much faith in.
I would have to hear/compare the A23 myself.
The two cables I suggest are suitable for 12', or so, and under runs (2 single runs per speaker are required).
DeKay