I am rebuilding a pair of 1234's. I cant find a crossover schematic for these. There is a number on the aluminum crossover plate 391922. I have installed a cheapo diaphragm from EBay in one horn. I see there is also a set available from people who claim to be using Altec equipment to build them now but 10 times the price. I went ahead and installed one diaphragm tonight and it ohms at 6.3 and sounds good with the sweep generator. The woofer sounds good but I get basically nothing out of the HF side. Before I just switch things around I want to know what goes where first. The one crossover has red,wht,grn and blk wires and from what I read rd to pos horn wht to neg horn grn to pos woofer and blk to neg woofer. The other crossover has a white wire where the grn one is on the other crossover and all the wiring looks really undersized. Original caps in here and I only checked the end one of I believe 6uf and it was OK. I stopped there and did not test the others.
Before I start testing all the caps I thought I would ask here and see if perhaps the diaphragm might be the problem. A schematic would be nice to if anyone has one. I lean towards a cap myself since they are well over 20 years old. I think the caaps should be 28, 10 and 6uf but I am not sure.