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Raytheon 12AX7 black plate square getter red print vs yellow print

Hi, I have been purchasing these tubes and all the ones I have are red label. I was wondering if there is any diffrence between the red vs yellow label. There are a pair of the yellow label on sale on ebay currently and are claimed to be D getter (it is hard to tell from the photo). All the tubes I have are circa 1950's square getters. Did Raytheon make a D getter 12AX7 and are these the yellow labled ones? I am guessing if this is the case that they may be early 50's production. The yellow labels are much rarer than the red. Has anyone compared these and are there any substantial sonic differences? Your expertise is appreciated.

Bart


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Topic - Raytheon 12AX7 black plate square getter red print vs yellow print - posbwp55@msn.com 21:36:49 10/1/06 (0)


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