Hi Geoff,
I’ve just filled in a web form to ask if they have a manual for the Kamplex KLD21 that I’m trying to fix for my son who is an audiologist. He was given it as faulty and the left side doesn’t work.
I suspect the reed relays on the main board and it will take until the end of April from a Chines supplier on eBay!
My point being is it shows up the global chip shortages (and age of the audiometer).