On one Russian forum, sorry didn't save the source, one guy claimed the
screen function is to quickly blank the connected nixie.
Marcin
On 16/02/2013 23:59, Jon wrote:
The most curious thing about the A201 is pin 9, whose function
translates as 'screen' or 'shield'. It's not shown in use on any circuit
diagram I've seen for this tube.
The only other counting tube I'm aware of with such a structure is the
G10/241E Nomotron (and of course the 11TU7 lookalike). The datasheet for
that also does not discuss the function, but specifies that it be set at
a +90V bias. J B Dance (Electronic Counting Circuits) suggests that the
purpose of the shield is to confine the glow to the required part of the
tube. It could well be a similar function for the A201. In the polyatron
configuration, unlike the dekatron, the discharge glow is associated
with the common electrode rather than the electrode which is spatially
specific for each counting position. This may mean that additional
measures like the shield are required to stop the glow spreading across
the common cathode and degrading the counting performance.
It's interesting that Marcin's datasheet says that the glow is purple,
whereas every A201 I've ever seen is neon-orange...
Jon.
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