Does it look like fake ECC83 / 12AX7 Mullards?

denrrou

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I bought this tube as NOS mullard from Holland. Putted it in v1 of a vintage marshall and played for a while. Turned the amp off and some time later i noticed only this specific tube was simply looking different, it was white instead of black, and upon checking i realized it was just broke near the base pins... I dont think something made an impact on it but i also never saw a tube fail like this. I have read there are some fake ones like this out there and i thought it would also be the case. What do you guys think by looking at the pictures?
 

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Dogs of Doom

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Does it say ' Mad in England'.
No expert but I think mullard knew how to spell made.
Also the box looks a bit new for an NOS valve.
it would actually say "Made in Holland"

but, here's a true MiH:

coje1r6coz9dqvpbf0fl.jpg
 

Dogs of Doom

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interestingly enough, there's some etching under the Mullard screen print rebranding, on one of these Holland ones from the reverb ad I found:

vsxfwbter9p7ranwgcwi.jpg


that coincides w/ the etching under the paint on the one in the OP...

here's the ad:


I'd say it's a fake though...
 

Dogs of Doom

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&... to the OP, I have seen that type of break before. It seems to happen at the line where the metal sleeve ends, where the base goes into.

My only guess, is that there's a excessive heat at the base of the tube & the difference in temp, from in the base sleeve & the open air is extreme enough to crack the glass. This coming from my many years as a glass fabricator, not necessarily a tube expert...

It's the same theory as this:

 

neikeel

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The pics look like a tube that has been reprinted
I see the pins are straight in the box pictures but bent in the pic on your amp and bent pins can cause the glass to crack and lose the vacuum.
So yep fake lettering on what is probably an old original.
 

denrrou

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The pics look like a tube that has been reprinted
I see the pins are straight in the box pictures but bent in the pic on your amp and bent pins can cause the glass to crack and lose the vacuum.
So yep fake lettering on what is probably an old original.
thanks!
does it look like a real mullard one? seems these black tops are no common, i was searching for images and the great majority are silver like.

the price was actually too good to be true
 

denrrou

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The pics look like a tube that has been reprinted
I see the pins are straight in the box pictures but bent in the pic on your amp and bent pins can cause the glass to crack and lose the vacuum.
So yep fake lettering on what is probably an old original.
better pics
the mad in part was gone after few hours of playing...
its possible the pins bented while trying to remove the tube from the socket, it was not easy since the tube lost connection with the bottom, needed to use more than naked hands.
 

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denrrou

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Never look at the printed logo. Look at the etched code. The triangle means Heerlen NL, B means Blackburn UK. I have Blackburn logo tubes made by Telefunken...
i got it, the fact is that i could not find on google images any blackburn stated as holland made... and there is no etched code, only the mullard logo, "mad in" "holland" and "ECC83" nothing else
 

StingRay85

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i got it, the fact is that i could not find on google images any blackburn stated as holland made... and there is no etched code, only the mullard logo, "mad in" "holland" and "ECC83" nothing else
Simple. No etched code means no Mullard.

And like others mentioned, no vacuum means no tube.
 

Jon Snell

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The valve has gone to air due to the incorrect positioning of the pins and a forced insertion.
Not a fault of the valve.
Glass cannot bend and the misplaced pin broke the seal.
It doesn't matter if the valve cost £0.30p or a ridiculously high priced £135, all glass will break when abused.
 

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