This exhibit is a Mullard British made 12AU7 that is branded IEC - the American reseller.The 12AU7 is a low μ double triode with a quoted gain of 17.![](../pics/aai0311a.jpg)
The 12AU7 near the top of the glass. Inside is the face of one anode.![](../pics/aai0311b.jpg)
The pair of triodes seen end on.The thin glass tube envelope is 20 mm in diameter and, excluding the B9A base pins, is 48 mm tall.References: Data-sheet & 1040. Type 12AU7 was first introduced in 1951. See also 1951 adverts. |