which TV audio out? headphone mini jack or optical, thru adapter to RCA input on amp?

Just be sure the optical out of the TV can be set to "PCM" and isn't fixed to Dolby Digital.
   From the FiiO TAISHAN-D03K  description: "....The input will accept up to 24-bit/192 kHz resolution PCM digital audio, but Dolby Digital and DTS are not supported."

Otherwise, you'll need something more expensive like this:
 https://www.bhphotovideo.com/c/product/660218-REG/Gefen_GTV_DD_2_AA_GTV_DD_2_AA_GefenTV_Digital_Audio.html