The triangle is a very very important sign for Nixie tube collectors.
in short:
No trinangle: pilot lot (rare tube)
"1" in triangle: quality category 1 (best quality)
"2" in triangle: quality category 2 (low quality)
"=" in triangle: bad tolerances (only for no-name products ect.)
"S" in triangle: special release
There are some more interesting signs - I will explain later in a special
article in cooperation with Jens.
Dieter
----- Original Message -----
From: "kay486" <[email protected]>
To: "neonixie-l" <[email protected]>
Sent: Wednesday, February 15, 2012 7:28 PM
Subject: [neonixie-l] Re: two versions of Z566M ?
btw, do you know why some of the Z566M tubes has the yellow triangle
with round corners stamped at back? Does it mean something or its just
sign of earlier/later series?
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