No they aren't, so I imagine you have to specify which one you want when you order it.
On Thursday, April 25, 2019 at 1:43:21 PM UTC-4, M1 wrote: > > Decided to take a quick look at clocks. > > I see some on ebay that state IN-18/Z5660M clocks. > > > > Are the two tubes interchangeable? > > > > Michail > > > -- 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 neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/2313f550-9349-4104-a7cd-28aee1cb814f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
