National NL-1265 Datasheet?

MichaelB

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Jan 5, 2020, 5:18:05 PM1/5/20

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Does anyone have a datasheet on this tube? I see it mentioned in some of Dieters stuff but cannot find a datasheet. Please forward if you have one, Thx

Dieter Waechter

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Jan 5, 2020, 6:10:25 PM1/5/20

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Hi!

Only thing known is that it is the same as Hewlett-Packard's 1970-0046.

Ther is no other 100% substitude since the comma shaped right hand dot.

It is a longlife type - rated life: 200k hrs. Ic is 2.3 mA nominal. (2-3.5 mA).

Best matching datasheet is Burroughs_Bulletin_1104D.pdf (youll find at my page)

See B-5441A there. Only difference is the shape of the RH DP.

Best regards

Dieter

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MichaelB

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Jan 6, 2020, 1:00:04 AM1/6/20

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Thanks Dieter!

Paul Andrews

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Jan 6, 2020, 8:18:35 AM1/6/20

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Sounds like the B54370A might also be a substitute? https://www.nixies.us/bwg_gallery/b54370a/ I don't have a datasheet for that either, but as it was a pull from an HP laser interferometer that also had B5441A tubes in it, I assume it is electrically identical.

Dieter Waechter

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Jan 7, 2020, 2:00:42 AM1/7/20

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Thank you Paul,
Oh yes, you are right. This is true. I did not know that it also has a
right hand comma. I updated my database now.
Do you have more than one of these?
Best regards
Dieter

Paul Andrews

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Jan 7, 2020, 9:34:49 AM1/7/20

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I have six.

> On Jan 7, 2020, at 2:00 AM, Dieter Waechter <in...@nocrotec.com> wrote:
>
> Thank you Paul,

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