Specifications

This is a sleeve of 5 NOS Mullard 5814A/12AU7A tubes. One tube lost its vacuum and is a dud, but is included anyway. Of the other four, two are black plates and two are gray plates. All are triple mica with "Mullard" and "Made in USA" printed on the glass. TV-7 test data is as follows (left to right in the photo): Tube 1: dudTube 2:86 86Tube 3:72 82Tube 4:96 100Tube 5:84 88 A reading of 86 would be new/nominal for a 12AU7 on a TV-7, so these are all measuring excellently, save for one of the triodes on tube #3.

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