6C33C tube stamp

[sphinx]

Hello...

I purchased some 6C33C tubes on Ebay and found that some of them were labeled with the stamp below.

[IMGHTTPDEAD]http://home.ca.inter.net/~sphinx/6C33C%20stamp.jpg[/IMGHTTPDEAD]

I decoded the text as "rechecked" or "retested" but my question is about the "X". Is this a tube that failed quality control?

 

[galvanic]

it's mean october

 

[Jeb-D.]

It means no good, I can get rid of them for you

 

[Colt45]

X-1992

10/1992 here.

 

[sphinx]

ok! oct/92...got it! thanks