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In Reply to: Large base Mullard.... posted by HOK on April 12, 2007 at 04:25:42:
Thats what they look like but they are later than the 50s and 60s because the xf1 mullard gz34 I have has a large base with a hole in center pin and these dont..See if yours have the hole in them..
The metal base ones were made by phillips even tho mullard and amperex both marketed them..If you look at the metal base ones they have no ribbing in the plate structure as the mul/amp ones did and they were all made in holland I think.
I like these better then the metalbase Mullards.
Great find, enjoy, and yes they are Mullard, only now every mamaluke with a GZ34 without a hole in the guidepin will be claiming it is a Mullard Fatbase.
Michael- HOK is right. June 1958 Blackburn Mullard production for the one you describe. Some but not all genuine f31 specimens totally lacked a center guide hole, just as some but not all contemporaneous big base Xf1 EL34s did. All of the later Blackburn made small base f32 GZ34s (and EL34s, Blackburn Xf2, Xf3, Xf4) had the holes, though.
I typed a word wrong..These do not have the hole in the center pin and all the mullards of the 50s and 60s did..I know these have to be later because they dont sound that good..It was my mistake tho because I forgot to put the word dont in for the hole in center pin.
I think I followed you. But it is definitely not the case that all authentic 1950's Blackburn made big base Mullard GZ34s had a hole in the guidepin, even though many did and you may well have some others that have the hole. Ditto for late '50s Blackburn made Mullard EL34s. You can bet the farm on that.
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