JKent Posted December 31, 2020 Report Share Posted December 31, 2020 I've worked on a lot of Model Five crossovers and most had point-to-point wiring but a few used printed circuit boards. I always "assumed" the PCBs came later but looking at serial numbers of the ones I've worked on it looks like PCBs were in the middle (??). I don't have serial numbers for all the ones I worked on because in some cases people just sent me the crossovers but the earliest SN I have is 1103 and the latest one I have is 21148. Those both had point-to-point as did most of the others in between. But 06845 and 12470 had PCBs. SN 10436 falls between those and it's point-to-point. This may be one of those unsolvable mysteries but does anyone have a clue? Also, were th production dates 1968 - 1972? thanks Kent Quote Link to comment Share on other sites More sharing options...
dxho Posted January 1, 2021 Report Share Posted January 1, 2021 Can't help you on xos, but production (or at least availability) dates for the Five went through 1977, according to buyer's guides of the time. Same for the Six, Nine, Seventeen, Thirty One, and Thirty Two. Quote Link to comment Share on other sites More sharing options...
JKent Posted January 1, 2021 Author Report Share Posted January 1, 2021 Thanks for the info. Every list of KLH products available has inevitable inaccuracies. One said '68-'72, which seemed short. The KLH Model History pinned the the beginning of the KLH section shows 1958 for the Five which I thought to be way off but then remembered they did have an earlier, different Model Five. Weird. I should have checked your list at http://www.aphenos.net/electronics/speakers/klh/all_klh.htm which is generally more accurate and does show '68 '77 for the Five. Quote Link to comment Share on other sites More sharing options...
KJ244 Posted March 15, 2021 Report Share Posted March 15, 2021 Hi Kent - I can add my data points from a pair of Model 5’s I recently refurbished. SN 43332 and 43338 had 1971 date code capacitors and the pcb version x-overs. Kevin Quote Link to comment Share on other sites More sharing options...
JKent Posted March 16, 2021 Author Report Share Posted March 16, 2021 On 3/14/2021 at 8:12 PM, KJ244 said: I recently refurbished. SN 43332 and 43338 had 1971 date code capacitors and the pcb version x-overs. Interesting. 43338 vs the newest one I'd worked on: 21148. So 22,190 between the two. Makes sense yours had pcb but I still don't get the inconsistency among the lower SNs. Probably never will 🤨 Quote Link to comment Share on other sites More sharing options...
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