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Large base Mullard....

I'm not an expert, but those are the real deal. That tube is commonly know as a large base Mullard.

Late 50s, early 60s production. I believe it was a transitional model between the metal base GZ34 and the smaller base GZ34. I'm sure one of the Mullard gurus can fill in the details.

VERY nice tube. Here's one I picked up at an estate sale.




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