Neon logic

From: William Donzelli <>
Date: Fri Feb 28 14:27:00 2003

> I've looked recently inside an Anita MK IV calculator and a doubt that you
> would want to use that many tubes with heaters in that small a case...

Most thyratrons have filaments anyway. The only one that leaps to mind
that doesn't is the Americal 0A4G, and it is an octal. I am sure there
are some other obscure types, but my Tube Lore is buried somewhere. The IBM
favorites 2D21 and 5696, have filaments (they are miniatures).

For something as simple as a calculator, you could get away with a couple
hundred subminiature tubes, and still be able to plug it into a standard
wall outlet, and still have it small enough to sit on a desk. The KWR-37
crypto box from the 1950s has something like 500 submini dual triodes, yet
still is only a few cubic feet.

Of course, no one in there right mind would pay for such a calculator.
> The thyratons it uses are cold cathode and quite small. It also uses 1
> Decatron tube...

Interesting. I would think there would be more Decatrons than that.

William Donzelli
Received on Fri Feb 28 2003 - 14:27:00 GMT

This archive was generated by hypermail 2.3.0 : Fri Oct 10 2014 - 23:35:57 BST