[AMPS] Are blue 4CX1000As OK?

[sm5ki@algonet.se (sm5ki)]

I am interested in a couple of 4CX1000As in clean original cartoons. The
only thing is they have a bluish coulor. Is this normal after many years
after they were made EIMAC? They may have been checked out with some years
interval by a commercial. Anyone?

de Hans SM5KI

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