Querry on NL1222S and NL1222B

[Bogdan Paduraru]

Dear friends ,

Does any one of you knows the difference between these 2 tubes ?

NL1222S and NL1222B

[David Forbes]

I don't know much about that tube, but the similar 5870 series uses the letter suffix to describe the pins and spacer plastic. 

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[Bogdan Paduraru]

Thank you David

Sounds correct , especially that they seems to be produced also  in Japan as per Johnathan' s site

https://www.swissnixie.com/tubes/NL1222/