The stock TAD-60 comes with Electro-Harmonix 6CA7s for output. It will run KT-88's or KT-66's. I went with the KT-66s on Paul's recommendation.
I did get the premium crossovers on the Solists.
On the rack the wood triangles are just morticed into the legs. I'll try to get some more detailed shots of the joinery and post them.