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Its possible that tube was introduced by another company, and GE left it out of thier manual because it competed with thier own offerings, or maybe it was a later type that just isnt in the older manuals. GE introduced the 12 pin Compactrons, but the other tube makers made them too, and even introduced new types once they became popular with tv makers. For some types of tubes, the extra pins were needed, which the competing other formats such as Novar and Magnoval tubes lacked.
Most tube companies wanted to be able to sell a full line of tubes, so they would rebrand tubes from other manufacturers to supply types they did not manufacture themselves, especially for low volume replacement sales.
Last edited by Olorin67; 06-07-2014 at 09:51 AM.
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