Quantity six 12AX7 double triode vacuum tubes, much prized by audiophiles:

1. Qty two boxed NOS 12AX7A made by Sylvania for US Air Force. See photo. Original USAF cartons. Both tubes show emission percentages around 106/107, so all four triodes are equal.
2. Qty one GE 6681/12AX7, NOS boxed. Emissions both triodes are 104%
3. Qty one 12AX7 marked Marconi, Made in Canada in Westinghouse box. Emission at 94% and 96%. Clean markings, possibly used.
4. Qty 0ne Mullard, Made in Gt. Britain, unboxed, clean markings, Emission at 104% both sections.
5. Qty one 12AX7 unknown manufacturer, probably used, emission 94% and 104%