I'd started a thread a while back asking if I should pursue a M-117 amp and the consensus was that I should fix my HK775 (160W) instead, and that the M-117 didn't sound as good as the amp section of the R-117. I have no experience with either, the only components I have from that era are a R-113, DZ-111, and I forget what the tape deck is, and now a TP-117.
I did program a Harmony 650 and was able to determine that I can switch inputs, although I haven't tested the phono section yet. So I dunno why it ended up getting donated... maybe because it *is* pretty useless without the remote?
BUT... upon reflection I think I may keep the TP-117 as it would allow me to get rid of three different components in that stack (preamp, tuner, and switch box - as the HK pre only has one aux input while the TP-117 has many)
I am definitely going to keep haunting that thrift to see if the remote turns up.