Re: AW43-88 - Manufacturers?
@Fernseh: The letter D was only used for receiving tubes. This is definitely a square, which means Valvo Aachen. I agree it was made there in july 1960.
782 means the second revision of tube code 78, which seems plausible. I previously spotted a 785 H1H, which would most likely be from their Eindhoven factory, made in august 1961.
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