Yes interesting. If you had not researched the white panel Mans, I would have assumed it must be a much later addition and not original. If some sets were modified or produced to accomodate this addition, why white? Was it just available? Was it to ID this particular version of the set, or simply to assist in finding that end in semi darkness? My 88 has the central jack socket but no blanks or markings on either side. It is labelled Slave 31 [top right] and I've been told by Sean W that it was probaly part of a diversity unit. Personally I would find the white panel a bit irritating [especially on such a great restoration] even if it is absolutely original but as I've done nothing much with mine yet, perhaps I shouldn't really comment
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Dave W
Could this high impedance Mod have had anything to do with the output stage design, so famous for blowing up the Output TX I wonder?