IV-4 vs IV-17 - What's the difference?

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Mac Doktor

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Jun 9, 2021, 5:16:06 PM6/9/21
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The subject says (asks) it all. I've read that they're identical. Perhaps the IV-17 came later? OTOH, I've also heard that VFDs with newer dates are dimmer.

What's the skinny?


Terry Bowman, KA4HJH
"The Mac Doctor"


“...the book said something astonishing, a very big thought. The stars, it said, were suns but very far away. The Sun was a star but close up.”—Carl Sagan, "The Backbone Of Night", Cosmos, 1980


Nicholas Stock

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Jun 9, 2021, 5:27:23 PM6/9/21
to 'Greg P' via neonixie-l
The only difference I know of is the filament voltages are different by 0.2V. When operated in multiplex in the correct range, both IV4 and IV17 look identical in my experience. 


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tntmod54321

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Jun 9, 2021, 6:31:01 PM6/9/21
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As far as I know iv-4 tubes are also rated for a longer lifespan and it might just be my eyes but iv-17s appear a little chunkier

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Nicholas Stock

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Jun 9, 2021, 7:01:44 PM6/9/21
to 'Greg P' via neonixie-l
I have 100's of each...I can't discern any noticeable difference between the two physically (except the numbering on the back!) :)

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