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I have a 12 volt Amperex Bugle Boy tube. I can see a bit of faint leftover markings 'Made in Holland' as well as the Bugle Boy white marking. The etched code is diagonal diamond (Holland)then 9E but the rest of the white markings are gone. Large halo getter, classic 'flash'at startup and grey plates.I'm certain that Amperex made a Bugle Boy 12AU7.
Did they also make a Bugle Boy marked 12AT7 and/or 12AX7?
It sounds fantastic but I would like to know what I have 12A, 12T, 12X to perhaps buy a backup.
Thanks
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I compared this Bugle Boy marked 12 volt tube to 5 Amperex Orange Globe 12AU7's I have and the internals appear identical. I'd still like to know if there is some other tell tale sign confirming it is a 12AU7.
Amperex made many 12AU7s including one that I have ben collecting for years the 7316.
The 7316 variant which as best I can tell is always a Heerlen Holland tube with the right triangle in the code. I also usually find "Ct#" on the top line of the code I put the # symbol for a number . So you might see the top line will be Ct5. The 2nd or bottom line starts with the right triangle.
Amperex made 12AX7s for sure but I don't recall if they also made the 12AT7 or ECC81.
I really like the 12AU7s they made, not just the 7316s.
You may be able to find your BB tube in the photo library that Tube Monger maintains.
Thanks, Mechans!
I only see 1 line of etched code (with the Heerlen triangle)and the other markings are so faint that even with high magnification, I can see no other lines of code.
I did a search and saw where 1 inmate thought the 12AT/12AX versions had shorter plates than the 12AU7. Don't know if that is true.
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