Who else can tell me the difference between the HP-40NB and the HP-NB?

2010-08-04View Original

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I recently saw that HP-40NB and HP-NB are used for converter tubes. What is the difference between them?

Reply #22010-08-04

There’s no difference; 40 represents the C content.

Reply #32010-08-04

The C content is 0.4%, right? Then it has the same meaning as the 40 in HK40, right? Are there any rules regarding whether to include 40 or not? Do HP-40NB and HP-NB have the same element content?

Reply #42010-08-04

*It’s the usual way of writing; it makes no difference whether 40 is included or not.

Reply #52014-06-23

An amazing element, Nb, niobium, has been added to the HP-40NB, which is why it is called HP-40Nb.

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Who else can tell me the difference between the HP-40NB and the HP-NB?

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