And now I have found that it was the ZM1263, I have found several other references:
https://www.americanradiohistory.com/hd2/IDX-Site-Early-Radio/Archive-Wireless-World-IDX/70s/Wireless-World-1971-05-OCR-Page-0114.pdf The ZM1263 is a side - viewing tube that contains symbols for alternating (N), plus (+), mines (-) and a fourth symbol, consisting of a spiral of two and a quarter turns for `equipment failed' or anything else that has no con- ventional symbol. On Wednesday, August 28, 2019 at 1:26:19 PM UTC-4, Bill Notfaded wrote: > > The venerable NL-5866SX... > > [image: s-l1600.jpg] > > [image: NL5866SX.jpg] > > [image: s-l1600 (1).jpg] > > [image: s-l1600 (2).jpg] > > [image: s-l1600 (3).jpg] > > [image: s-l1600 (4).jpg] > > It's really all just about the spiral though... I'm not even sure what the > symbol is for to be honest but I've rarely seen it a few times and just > happy to have a couple NOS finally. > > > Regards, > > > Bill > > > > > > > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/c0e47bb7-37ba-44a5-8f63-267de151a62e%40googlegroups.com.
