299's are way more reliable than the 277 and a much easier design to work on. corey cohen uǝɥoɔ ʎǝɹoɔ > On Dec 26, 2015, at 8:03 PM, william degnan via vcf-midatlantic <vcf-midatlantic at lists.vintagecomputerfederation.org> wrote: > > BTW - I have 299's not 277's. Similar but different. I replaced the disk > sensor in one of mine. Otherwise caps.