My Tayda 555s are TI iirc (didn’t build this pedal yet, just to be clear tho), but they do list their 555s manufacturer on their site as “various”, meaning each of us could order 555s and be getting a different manufacturer/batch depending on which they have on hand at the moment (or they potentially even have different manufacturers on hand at the same time, and it comes down to which selection is nearer in the warehouse for whoever is packing your order at the time). I’ll be building mine soon, and my 555s were Tayda-sourced in May of this year. I’ll report back after I build it, but it’s probably worthwhile, if people who have built it are noting where they sourced components from, to mention when they sourced certain components if they were ordered from Tayda. Many of us have stashes of some of the components for this project already, and a 555 from Tayda from March May is quite likely a different batch, and may be a complete different manufacturer compared to a 555 from Tayda from this month or a 555 from Tayda from last November.