On Thursday, October 30, 2025 at 5:08:04 PM UTC-4 Nicholas Stock wrote:
3BP1A tubes still have a rounded face, so not sure that's correct... LOL - it appears my 'understanding' is *not* correct. Thankfully, I can rely on my browser AI to reveal the facts - the 'A' versions are manufacturing revisions incorporating minor engineering or tolerance changes. So, something changed and the 'A' version replaced the original. It's likely there were performance improvements made, though it's also possible the changes were made for manufacturing reasons. Perhaps the flat face of the 3RP1A was created out of demand for a flat face tube that was interchangeable with designs using the 3RP1. Regarding the earlier comment about the 3RP1A, I suspect the flat face might result in some optical focusing issues at the edge of the face due to the geometry of the glass at that point. I've seen several scope clocks with the 3RP1A tubes and never noticed any issues - though the display on a scope clock rarely goes edge to edge, unlike test gear such as an oscilloscope where the trace may extend beyond the edge of the face. -- 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, visit https://groups.google.com/d/msgid/neonixie-l/27335115-7fe1-4e36-b2e5-5e0e55ff5e11n%40googlegroups.com.
