I am new here. I acquired recently an Apple 1 reproduction PCB, maybe without thinking things entirely through ;) I am now considering building my Apple 1 replica and I read many of the message on these forums.
As of late 2023, in the absence of Uncle Bernie's kits, am I right that I don't have a choice but to spend approximately $150 on eBay for a set of 7 2504v and about $75 if not more for a single, untested 2519N or 2519B? My understanding is that these are the most if not the only really problematic components at this point.
I also have another question regarding the family of TTL chips to choose. I read in [this discussion thread](https://www.applefritter.com/content/replace-2504-1404-am2804pc) a post by Uncle Bernie about the fact that LS chips might not work with the 2504v. So I gather that the LS series should be avoided, and that only plain 74xx chips should be sourced. But I am wondering if there is anything else to be aware of regarding those.
Thanks in advance,