To me the 's' generally means it probably has newer electronics and can do things like accept component video directly. Its not really a Sony tube indicator. The BD808s has MEC tubes as does the later BG1208s and I think all 1209 models.
In addition to accepting component input and some other upgrades (noticeably additional adjustments) I believe the S models of the 1209 have Schimpflug (I am probably butchering the spelling). Regular 1209 models do not have Schimpflug though I am not sure about the 1209/2 models. All 1208 models, plain, S, and /2 have Schimpflug.
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