IN-23 Cathode Resistors?

[Mac Doktor]

Has anyone figured out the values of the cathode resistors for the IN-23? I lucked out and scored one on eBay for $72 a while back. The prices have risen dramatically since then so I don't want to fry the only one I'll ever have.

Just curious. And if anyone has already laid out a PC board my curiosity will into full blown interest.

Terry Bowman, KA4HJH
"The Mac Doctor"

“Reality is that which, when you stop believing in it, doesn't go away.”–Philip K. Dick, "I Hope I Shall Arrive Soon"

[liam bartosiewicz]

This is a complete guess, but the B-5971 has similarly sized cathodes, so maybe start with the values given for that tube.

On Dec 24, 2021, at 2:06 PM, Mac Doktor <themac...@gmail.com> wrote:

Has anyone figured out the values of the cathode resistors for the IN-23? I lucked out and scored one on eBay for $72 a while back. The prices have risen dramatically since then so I don't want to fry the only one I'll ever have.

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[Roman H.]

IN-23:

38k = K2, K4, K10

70k = K3, K6, K7, K9, K11, K13

160K = K1, K5, K8, K12

I used these values to get the correct current per segment at 170 V, which is listed as lowest segment current in the datasheet:

https://rudatasheet.ru/tubes/in-23/   (you can translate it with google chrome)

here is my 10-digit-IN-23 display i made:  https://www.youtube.com/watch?v=ZfoV3-rsbNQ

The currents for the B5971 are different:

B-5971:

47k = K10, K13

22k = K8

39k = K1, K2, K3, K4, K5, K6, K7, K9, K11, K12