Interconnects for MHDT Orchid

I have been using an old TADAC DAC which had balanced outputs. So I had been using Acoustic Zen Matrix Reference II balanced cables. So, with the Orchid I need to switch to RCA cables. I know they make an adapter (balanced to RCA) but I read some negative things about them. With regard to what I am looking for, better soundstage and softening of high frequency treble/less high frequency brightness. 

Thanks or all the responses, decooney, which Tesla tube did you use?

Thanks for all the input about tubes. Any other suggestions about the cables and/or cables/tube combinations? Thanks

Thanks for your responses. A "transparent, lively cable" was mentioned.

Any specific name of cables? Any other MHDT users out there?