B-5972

[Adam Piórko]

Hi,

Does anyone know anything about b-5972?

[Richard Scales]

Hmm, there must be some difference between that and the B-5971 - though what, I don't know.

Is it the same in as much as it has the same segments (difficult to tell from your picture) ?

 - Richard

[liam bartosiewicz]

Perhaps it has different electrical characteristics? It looks pretty much identical to a 5971.

On Sep 5, 2023, at 7:46 AM, Richard Scales <ric...@scalesweb.co.uk> wrote:

Hmm, there must be some difference between that and the B-5971 - though what, I don't know.

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[Audrey]

I have one of these aswell- at least, it was sold as a B-5792, the part number is sort of smudged, 2 of these showed up on ebay from the same seller recently so I imagine this is the other one, it has the same segments as B-5971 tubes as far as I can tell.

[chuckrr]

Maybe 5972 is mercury version of non-mercury 5971?

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[Nicholas Stock]

Are the central or top and bottom segments still continuous in this version? I could imagine that an 'improved/subsequent' version may copy the 7971 configuration as the 5971 is only a 13 segment display....IIRC.

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[Adam Piórko]

I have B-5971 and NL-5971.
I'm currently having a renovation. My collection is buried in boxes.
I'll see if it makes a difference this weekend.

[Audrey]

this tube indeed contains mercury, though I think normal 5971s do too, the top and bottom horizontal segments are still only one segment each, and the middle vertical line is still only one segment aswell.

[Greg P]

Could it be something as simple as when they stamped the tube it was a typo?

[Audrey]

It's possible, they did stamp some NL-5991s as "National Elecscronics", though I think it might be something like a different gas mixture, I had to use 250v to get multiple segments to light (I was using cathode resistors, so dunno what's up with that)