I've been working on going through my files and searching the net to better fill out the DQ-10 revisions tracked in the Wiki. I'm currently at eleven with a few not worth mentioning because they just involved changing brand of capacitors and resistors, but not type. (Wouldn't mind any input if someone has examples of other revisions so I can fill things out better. There's some conflicting information I'm trying to sort out.) So, near as I've been able to tell, by serial number 29093 when factory mirror-imaged baffles were introduced, the design of the functional bits were finalized. By that time, the crossover hadn't changed since s/n 22000 and remained what it was until production was ceased in the low 50000s in 1988. The only change that happened is that oak trim rails were added as an option in 1981.
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So, your s/n 47xxxs coming out in the mid to late '80s are newer, but functionally the same as the others that came out in the early '80s. Near as I can tell, there's no reason to not just stick with the pair in better condition and call it good.
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