Amperex 8453 Counter tube

[peter bunge]

I searched on this tube and found nothing.

Before I spend time designing a circuit to drive it, has any one already done so?

I don't mean the circuit in the data sheet, I mean a solid state driver for the ten starter pins.

Ehat does I.C. mean on pin 6? Or is it N/C as in Not Connected? 

[David Forbes]

I.C. means Internal Connection. It's usually connected to part of the tube structure. Leave it unconnected.

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[Charles MacDonald]

On 2020-10-28 8:23 p.m., peter bunge wrote:

> Ehat does I.C. mean on pin 6? Or is it N/C as in Not Connected?

on most tube diagrams - IC means "Internal Connection". the pin is
attached to some part of the structure of the tube, and is not to be
used. NC is no connection and the socket pin is generally permissible
to use as a tie point or terminal.

often the IC pin is used as a structural support, but the manufacturer
does not want to promise that it will be to the same element on future
production.


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[Jon]

8453 is the US EIA/JEDEC registration for the Philips Z550M, also found in Europe marked as ZM1050. If you search Z550M you'll have more luck. But really all you need is Ronald Dekker's comprehensive piece of historical research at https://www.dos4ever.com/Z550M/Z550M.html

Jon.

[Dekatron42]

Ronald Dekker at https://www.dos4ever.com/Z550M/Z550M.html has written an article on the development of these. There is also an article in Elektor magazine from 2009 where Ronald shows how to drive them with a CMOS CD4017, have a look here: http://gkdv.se/pub/material/electronics%20magazine%20and%20such/Elector/Elektor%20Magazines%20(upd.%2019-03-05)/2009/12%20US200912.pdf

If you design the powersupply as Philips shows in their datasheet (and Ronald in the Elektor article) you only have to short the starter electrode to the common ground connection (the positive half wave rectified voltage at the diode rectifier) to light that digit up.

/Martin

[peter bunge]

Thank you Martin and the others that explained that I.C. means Internal Connection.

I thought of the 4017 last night and looked up the maximum voltage of 6 volts. I was not sure if that would be enough for reliable switching but apparently it is.

Thank you for the Elektor article link, I think the ring counter would be more in keeping with the age of the tube and I will try that. This has saved me a lot of time.

I bought other Trochotrons, Dekatrons, a working E1T on a breadboard, Nixies, VFDs, and a Numitron that I intend to make into a "History of Digital Displays" as a single unit with all displays counting together. The Numitron was the first digital display I used in my career as a research technician.

Peter

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[Dekatron42]

Ronald Dekker also has an article on Ring counters too: https://www.dos4ever.com/ring/ring.html if you want to know more about them - circuits with neon tubes and semiconductors are shown and explained, even driving Nixies.

/Martin

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